Publications

Submitted
Hana K Warner, Jeffrey Holzgrafe, Beatriz Yankelevich, David Barton, Stefano Poletto, CJ Xin, Neil Sinclair, Di Zhu, Eyob Sete, Brandon Langley, Emma Batson, Marco Colangelo, Amirhassan Shams-Ansari, Graham Joe, Karl K Berggren, Liang Jiang, Matthew Reagor, and Marko Loncar. Submitted. “Coherent control of a superconducting qubit using light.” https://arxiv.org/abs/2310.16155. Publisher's VersionAbstract
Quantum science and technology promise the realization of a powerful computational resource that relies on a network of quantum processors connected with low loss and low noise communication channels capable of distributing entangled states [1,2]. While superconducting microwave qubits (3-8 GHz) operating in cryogenic environments have emerged as promising candidates for quantum processor nodes due to their strong Josephson nonlinearity and low loss [3], the information between spatially separated processor nodes will likely be carried at room temperature via telecommunication photons (200 THz) propagating in low loss optical fibers. Transduction of quantum information [4-10] between these disparate frequencies is therefore critical to leverage the advantages of each platform by interfacing quantum resources. Here, we demonstrate coherent optical control of a superconducting qubit. We achieve this by developing a microwave-optical quantum transducer that operates with up to 1.18% conversion efficiency (1.16% cooperativity) and demonstrate optically-driven Rabi oscillations (2.27 MHz) in a superconducting qubit without impacting qubit coherence times (800 ns). Finally, we discuss outlooks towards using the transducer to network quantum processor nodes.
[PDF]
Kazuhiro Kuruma, Benjamin Pingault, Cleaven Chia, Michael Haas, Graham D Joe, Daniel Rimoli Assumpcao, Sophie Weiyi Ding, Chang Jin, CJ Xin, Matthew Yeh, Neil Sinclair, and Marko Lončar. Submitted. “Engineering Phonon-Qubit Interactions using Phononic Crystals.” https://arxiv.org/abs/2310.06236v1. Publisher's VersionAbstract
The ability to control phonons in solids is key for diverse quantum applications, ranging from quantum information processing to sensing. Often, phonons are sources of noise and decoherence, since they can interact with a variety of solid-state quantum systems. To mitigate this, quantum systems typically operate at milli-Kelvin temperatures to reduce the number of thermal phonons. Here we demonstrate an alternative approach that relies on engineering phononic density of states, drawing inspiration from photonic bandgap structures that have been used to control the spontaneous emission of quantum emitters. We design and fabricate diamond phononic crystals with a complete phononic bandgap spanning 50 - 70 gigahertz, tailored to suppress interactions of a single silicon-vacancy color center with resonant phonons of the thermal bath. At 4 Kelvin, we demonstrate a reduction of the phonon-induced orbital relaxation rate of the color center by a factor of 18 compared to bulk. Furthermore, we show that the phononic bandgap can efficiently suppress phonon-color center interactions up to 20 Kelvin. In addition to enabling operation of quantum memories at higher temperatures, the ability to engineer qubit-phonon interactions may enable new functionalities for quantum science and technology, where phonons are used as carriers of quantum information.
[PDF]
Can M Knaut, Aziza Suleymanzade, Yan-Cheng Wei, Daniel R Assumpcao, Pieter-Jan Stas, Yan Qi Huan, Bartholomeus Machielse, Erik N Knall, Madison Sutula, Gefen Baranes, Neil Sinclair, Chawina De-Eknamkul, David S Levonian, Mihir K Bhaskar, Hongkun Park, Marko Lončar, and Mikhail D Lukin. Submitted. “Entanglement of Nanophotonic Quantum Memory Nodes in a Telecommunication Network.” https://arxiv.org/abs/2310.01316. Publisher's VersionAbstract
A key challenge in realizing practical quantum networks for long-distance quantum communication involves robust entanglement between quantum memory nodes connected via fiber optical infrastructure. Here, we demonstrate a two-node quantum network composed of multi-qubit registers based on silicon-vacancy (SiV) centers in nanophotonic diamond cavities integrated with a telecommunication fiber network. Remote entanglement is generated via the cavity-enhanced interactions between the SiV's electron spin qubits and optical photons. Serial, heralded spin-photon entangling gate operations with time-bin qubits are used for robust entanglement of separated nodes. Long-lived nuclear spin qubits are used to provide second-long entanglement storage and integrated error detection. By integrating efficient bi-directional quantum frequency conversion of photonic communication qubits to telecommunication frequencies (1350 nm), we demonstrate entanglement of two nuclear spin memories through 40 km spools of low-loss fiber and a 35 km long fiber loop deployed in the Boston area urban environment, representing an enabling step towards practical quantum repeaters and large-scale quantum networks.
[PDF]
Graham D Joe, Cleaven Chia, Benjamin Pingault, Michael Haas, Michelle Chalupnik, Eliza Cornell, Kazuhiro Kuruma, Bartholomeus Machielse, Neil Sinclair, Srujan Meesala, and Marko Lončar. Submitted. “High Q-factor diamond optomechanical resonators with silicon vacancy centers at millikelvin temperatures.” https://arxiv.org/abs/2310.18838. Publisher's VersionAbstract
Phonons are envisioned as coherent intermediaries between different types of quantum systems. Engineered nanoscale devices such as optomechanical crystals (OMCs) provide a platform to utilize phonons as quantum information carriers. Here we demonstrate OMCs in diamond designed for strong interactions between phonons and a silicon vacancy (SiV) spin. Using optical measurements at millikelvin temperatures, we measure a linewidth of 13 kHz (Q-factor of ~440,000) for 6 GHz acoustic modes, a record for diamond in the GHz frequency range and within an order of magnitude of state-of-the-art linewidths for OMCs in silicon. We investigate SiV optical and spin properties in these devices and outline a path towards a coherent spin-phonon interface.
[PDF]
Sophie W. Ding, Michael Haas, Xinghan Guo, Kazuhiro Kuruma, Chang Jin, Zixi Li, David D. Awschalom, Nazar Delegan, F. Joseph Heremans, Alex High, and Marko Loncar. Submitted. “High-Q Cavity Interface for Color Centers in Thin Film Diamond.” arXiv:2402.05811. Publisher's VersionAbstract
Quantum information technology offers the potential to realize unprecedented computational resources via secure channels capable of distributing entanglement between quantum computers. Diamond, as a host to atom-like defects with optically-accessible spin qubits, is a leading platform to realize quantum memory nodes needed to extend the reach of quantum links. Photonic crystal (PhC) cavities enhance light-matter interaction and are essential ingredients of an efficient interface between spins and photons that are used to store and communicate quantum information respectively. Despite great effort, however, the realization of visible PhC cavities with high quality factor (Q) and design flexibility is challenging in diamond. Here, we demonstrate one- and two-dimensional PhC cavities fabricated in recently developed thin-film diamonds, featuring Q-factors of 1.8x10^5 and 1.6x10^5, respectively, the highest Qs for visible PhC cavities realized in any material. Importantly, our fabrication process is simple and high-yield, based on conventional planar fabrication techniques, in contrast to previous approaches that rely on complex undercut methods. We also demonstrate fiber-coupled 1D PhC cavities with high photon extraction efficiency, and optical coupling between a single SiV center and such a cavity at 4K achieving a Purcell factor of 13. The demonstrated diamond thin-film photonic platform will improve the performance and scalability of quantum nodes and expand the range of quantum technologies.
Yunxiang Song, Yaowen Hu, Marko Loncar, and Ki Youl Yang. Submitted. “Hybrid Kerr-electro-optic frequency combs on thin-film lithium niobate.” arXiv:2402.11669. Publisher's VersionAbstract
Optical frequency combs are indispensable links between the optical and microwave domains, enabling a wide range of applications including precision spectroscopy, ultrastable frequency generation, and timekeeping. Chip-scale integration miniaturizes bulk implementations onto photonic chips, offering highly compact, stable, and power-efficient frequency comb sources. State of the art integrated frequency comb sources are based on resonantly-enhanced Kerr effect and, more recently, on electro-optic effect. While the former can routinely reach octave-spanning bandwidths and the latter feature microwave-rate spacings, achieving both in the same material platform has been challenging. Here, we leverage both strong Kerr nonlinearity and efficient electro-optic phase modulation available in the ultralow-loss thin-film lithium niobate photonic platform, to demonstrate a hybrid Kerr-electro-optic frequency comb with stabilized spacing. In our approach, a dissipative Kerr soliton is first generated, and then electro-optic division is used to realize a frequency comb with 2,589 comb lines spaced by 29.308 GHz and spanning 75.9 THz (588 nm) end-to-end. Further, we demonstrate electronic stabilization and control of the soliton spacing, naturally facilitated by our approach. The broadband, microwave-rate comb in this work overcomes the spacing-span tradeoff that exists in all integrated frequency comb sources, and paves the way towards chip-scale solutions for complex tasks such as laser spectroscopy covering multiple bands, micro- and millimeter-wave generation, and massively parallel optical communications.
Isaac Luntadila Lufungula, Amirhassan Shams-Ansari, Dylan Renaud, Camiel Op de Beeck, Stijn Cuyvers, Stijn Poelman, Maximilien Billet, Gunther Roelkens, Marko Loncar, and Bart Kuyken. Submitted. “Integrated resonant electro-optic comb enabled by platform-agnostic laser integration.” arXiv:2401.16242. Publisher's VersionAbstract
The field of integrated photonics has significantly impacted numerous fields including communication, sensing, and quantum physics owing to the efficiency, speed, and compactness of its devices. However, the reliance on off-chip bulk lasers compromises the compact nature of these systems. While silicon photonics and III-V platforms have established integrated laser technologies, emerging demands for ultra-low optical loss, wider bandgaps, and optical nonlinearities necessitate other platforms. Developing integrated lasers on less mature platforms is arduous and costly due to limited throughput or unconventional process requirements. In response, we propose a novel platform-agnostic laser integration technique utilizing a singular design and process flow, applicable without modification to a diverse range of platforms. Leveraging a two-step micro-transfer printing method, we achieve nearly identical laser performance across platforms with refractive indices between 1.7 and 2.5. Experimental validation demonstrates strikingly similar laser characteristics between devices processed on lithium niobate and silicon nitride platforms. Furthermore, we showcase the integration of a laser with a resonant electro-optic comb generator on the thin-film lithium niobate platform, producing over 80 comb lines spanning 12 nm. This versatile technique transcends platform-specific limitations, facilitating applications like microwave photonics, handheld spectrometers, and cost-effective Lidar systems, across multiple platforms.
Rubaiya Emran, Michelle Chalupnik, Erik N. Knall, Ralf Riedinger, Cleaven Chia, and Marko Loncar. Submitted. “Limitations in design and applications of ultra-small mode volume photonic crystals.” arXiv:2402.00363. Publisher's VersionAbstract
Ultra-small mode volume nanophotonic crystal cavities have been proposed as powerful tools for increasing coupling rates in cavity quantum electrodynamics systems. However, their adoption in quantum information applications remains elusive. In this work, we investigate possible reasons why, and analyze the impact of different low mode volume resonator design choices on their utility in quantum optics experiments. We analyze band structure features and loss rates of low mode volume bowtie cavities in diamond and demonstrate independent design control over cavity-emitter coupling strength and loss rates. Further, using silicon vacancy centers in diamond as exemplary emitters, we investigate the influence of placement imprecision. We find that the benefit on photon collection efficiency and indistinguishability is limited, while the fabrication complexity of ultra-small cavity designs increases substantially compared to conventional photonic crystals. We conclude that ultra-small mode volume designs are primarily of interest for dispersive spin-photon interactions, which are of great interest for future quantum networks.
Mengdi Sun, Marko Lončar, Vassilios Kovanis, and Zin Lin. Submitted. “Nonlinear Multi-Resonant Cavity Quantum Photonics Gyroscopes Quantum Light Navigation.” https://arxiv.org/abs/2307.12167. Publisher's VersionAbstract
We propose an on-chip all-optical gyroscope based on nonlinear multi-resonant cavity quantum photonics in thin film χ(2) resonators -- Quantum-Optic Nonlinear Gyro or QONG in short. The key feature of our gyroscope is co-arisal and co-accumulation of quantum correlations, nonlinear wave mixing and non-inertial signals, all inside the same sensor-resonator. We theoretically analyze the Fisher Information of our QONGs under fundamental quantum noise conditions. Using Bayesian optimization, we maximize the Fisher Information and show that ∼900× improvement is possible over the shot-noise limited linear gyroscope with the same footprint, intrinsic quality factors and power budget.
[PDF]
Caique C. Rodrigues, Nick J. Schilder, Roberto O. Zurita, Letícia S. Magalhães, Amirhassan Shams-Ansari, Thiago P. M. Alegre, Marko Lončar, and Gustavo S. Wiederhecker. Submitted. “On-Chip Backward Stimulated Brillouin Scattering in Lithium Niobate Waveguides .” https://arxiv.org/abs/2311.18135. Publisher's VersionAbstract
We report on the first experimental demonstration of backward stimulated Brillouin scattering (SBS) in Lithium Niobate on Insulator (LNOI) waveguides. Performing polarization-dependent pump-probe experiments, we successfully quantified both intramodal and intermodal scattering among fundamental modes, showcasing substantial gains up to GB=10m−1W−1. Such large gains on simple waveguides open a pathway for unlocking novel opto-electro-mechanical phenomena within the LNOI platform.
[PDF]
Xinrui Zhu, Yaowen Hu, Shengyuan Lu, Hana K. Warner, Xudong Li, Yunxiang Song, Leticia Magalhaes, Amirhassan Shams-Ansari, Neil Sinclair, and Marko Loncar. Submitted. “Twenty-nine million Intrinsic Q-factor Monolithic Microresonators on Thin Film Lithium Niobate.” arXiv:2402.16161. Publisher's VersionAbstract
The recent emergence of thin-film lithium niobate (TFLN) has extended the landscape of integrated photonics. This has been enabled by the commercialization of TFLN wafers and advanced nanofabrication of TFLN such as high-quality dry etching. However, fabrication imperfections still limit the propagation loss to a few dB/m, restricting the impact of this platform. Here, we demonstrate TFLN microresonators with a record-high intrinsic quality (Q) factor of twenty-nine million, corresponding to an ultra-low propagation loss of 1.3 dB/m. We present spectral analysis and the statistical distribution of Q factors across different resonator geometries. Our work pushes the fabrication limits of TFLN photonics to achieve a Q factor within one order of magnitude of the material limit.
Yuqi Zhao, Dylan Renaud, Demitry Farfurnik, Subhojit Dutta, Neil Sinclair, Marko Lončar, and Edo Waks. Submitted. “Cavity-enhanced narrowband spectral filters using rare-earth ions doped in thin-film lithium niobate.” https://arxiv.org/abs/2401.09655. Publisher's Version
Michelle Chalupnik, Anshuman Singh, James Leatham, Marko Loncar, and Moe Soltani. Submitted. “Nanophotonic Phased Array XY Hamiltonian Solver.” arXiv:2402.01153. Publisher's VersionAbstract
Solving large-scale computationally hard optimization problems using existing computers has hit a bottleneck. A promising alternative approach uses physics-based phenomena to naturally solve optimization problems wherein the physical phenomena evolves to its minimum energy. In this regard, photonics devices have shown promise as alternative optimization architectures, benefiting from high-speed, high-bandwidth and parallelism in the optical domain. Among photonic devices, programmable spatial light modulators (SLMs) have shown promise in solving large scale Ising model problems to which many computationally hard problems can be mapped. Despite much progress, existing SLMs for solving the Ising model and similar problems suffer from slow update rates and physical bulkiness. Here, we show that using a compact silicon photonic integrated circuit optical phased array (PIC-OPA) we can simulate an XY Hamiltonian, a generalized form of Ising Hamiltonian, where spins can vary continuously. In this nanophotonic XY Hamiltonian solver, the spins are implemented using analog phase shifters in the optical phased array. The far field intensity pattern of the PIC-OPA represents an all-to-all coupled XY Hamiltonian energy and can be optimized with the tunable phase-shifters allowing us to solve an all-to-all coupled XY model. Our results show the utility of PIC-OPAs as compact, low power, and high-speed solvers for nondeterministic polynomial (NP)-hard problems. The scalability of the silicon PIC-OPA and its compatibility with monolithic integration with CMOS electronics further promises the realization of a powerful hybrid photonic/electronic non-Von Neumann compute engine.
Yunxiang Song, Yaowen Hu, Xinrui Zhu, Ki Youl Yang, and Marko Loncar. Submitted. “Octave-spanning Kerr soliton microcombs on thin-film lithium niobate.” arXiv:2403.01107. Publisher's VersionAbstract
Dissipative Kerr solitons from optical microresonators, commonly referred to as soliton microcombs, have been developed for a broad range of applications, including precision measurement, optical frequency synthesis, and ultra-stable microwave and millimeter wave generation, all on a chip. An important goal for microcombs is self referencing, which requires octave-spanning bandwidths to detect and stabilize the comb carrier envelope offset frequency. Further, detection and locking of the comb spacings are often achieved using frequency division by electro-optic modulation. The thin-film lithium niobate photonic platform, with its low loss, strong second-order nonlinearity, and large Pockels effect, is ideally suited for these tasks. However, octave-spanning soliton microcombs are challenging to demonstrate on this platform, largely complicated by strong Raman effects hindering reliable fabrication of soliton devices. Here, we demonstrate entirely connected and octave-spanning soliton microcombs on thin-film lithium niobate. With appropriate control over microresonator free spectral range and dissipation spectrum, we show that soliton-inhibiting Raman effects are suppressed, and soliton devices are fabricated with near-unity yield. Our work offers an unambiguous method for soliton generation on strongly Raman-active materials. Further, it anticipates monolithically integrated, self-referenced frequency standards in conjunction with established technologies, such as periodically poled waveguides and electro-optic modulators, on thin-film lithium niobate.
Rebecca Cheng, Mengjie Yu, Amirhassan Shams-Ansari, Yaowen Hu, Christian Reimer, Mian Zhang, and Marko Lončar. Submitted. “On-chip synchronous pumped χ(3) optical parametric oscillator on thin-film lithium niobate.” arXiv. Publisher's VersionAbstract
Optical parametric oscillation (OPO) has widely been utilized as a means of generating light with wide spectral coverage from a single pump laser. These oscillators can be driven using either continuous-wave (CW) light, which only requires lining up of the pump frequency with OPO resonance, or pulsed light, which also mandates that the repetition rate of the pulse and free spectral range of the OPO cavity are carefully tuned to match each other. Advancements in nanophotonics have ignited interest in chip-scale OPOs, which enable low-footprint and high-efficiency solutions to broadband light generation. CW-pumped integrated OPO has been demonstrated using both χ(2) and χ(3) parametric oscillation. However, realizing pulse-driven on-chip OPO remains challenging, as microresonator cavities have limited tuning range in the FSR and resonance frequency compared to traditional bulk cavities. Here, we overcome this limitation and demonstrate a χ(3) pulse-driven OPO by using a tunable on-chip femtosecond pulse generator to synchronously pump the oscillator. The output frequency comb generated by our OPO has 30-GHz repetition rate, spans 2/5 of an octave and consists of over 1400 comb lines with a pump-to-comb conversion efficiency of 10%.
2024
Mengdi Sun, Vassilios Kovanis, Marko Lončar, and Zin Lin. 3/22/2024. “Bayesian optimization of Fisher Information in nonlinear multiresonant quantum photonics gyroscopes.” Nanophotonics, 2024-0032. Publisher's VersionAbstract
We propose an on-chip gyroscope based on nonlinear multiresonant optics in a thin film χ (2) resonator that combines high sensitivity, compact form factor, and low power consumption simultaneously. We theoretically analyze a novel holistic metric – Fisher Information capacity of a multiresonant nonlinear photonic cavity – to fully characterize the sensitivity of our gyroscope under fundamental quantum noise conditions. Leveraging Bayesian optimization techniques, we directly maximize the nonlinear multiresonant Fisher Information. Our holistic optimization approach orchestrates a harmonious convergence of multiple physical phenomena – including noise squeezing, nonlinear wave mixing, nonlinear critical coupling, and noninertial signals – all encapsulated within a single sensor-resonator, thereby significantly augmenting sensitivity. We show that ∼ 470 × improvement is possible over the shot-noise limited linear gyroscope with the same footprint, intrinsic quality factors, and power budget.
10.1515_nanoph-2024-0032.pdf
Jeffrey Holzgrafe, Eric Puma, Rebecca Cheng, Hana Warner, Amirhassan Shams-Ansari, Raji Shankar, and Marko Lončar. 1/29/2024. “Relaxation of the electro-optic response in thin-film lithium niobate modulators.” Optics Express, 32, Pp. 3619. Publisher's VersionAbstract

Thin-film lithium niobate (TFLN) is a promising electro-optic (EO) photonics platform with high modulation bandwidth, low drive voltage, and low optical loss. However, EO modulation in TFLN is known to relax on long timescales. Instead, thermo-optic heaters are often used for stable biasing, but heaters incur challenges with cross-talk, high power, and low bandwidth. Here, we characterize the low-frequency (1 mHz to 1 MHz) EO response of TFLN modulators, investigate the root cause of EO relaxation and demonstrate methods to improve bias stability. We show that relaxation-related effects can enhance EO modulation across a frequency band spanning 1kHz to 20kHz in our devices – a counter-intuitive result that can confound measurement of half-wave voltage  in TFLN modulators. We also show that EO relaxation can be slowed by more than 104-fold through control of the LN-metal interface and annealing, offering progress toward lifetime-stable EO biasing. Such robust EO biasing would enable applications for TFLN devices where cross-talk, power, and bias bandwidth are critical, such as quantum devices, high-density integrated photonics, and communications.

[PDF]
Sophie Weiyi Ding, Benjamin Pingault, Linbo Shao, Neil Sinclair, Bartholomeus Machielse, Cleaven Chia, Smarak Maity, and Marko Lončar. 1/19/2024. “Integrated Phononic Waveguides in Diamond.” Phys. Rev. Applied, 21, Pp. 014034. Publisher's VersionAbstract
Efficient generation, guiding, and detection of phonons, or mechanical vibrations, are of interest in various fields including radio frequency communication, sensing, and quantum information. Diamond is an important platform for phononics because of the presence of strain-sensitive spin qubits, and its high Young's modulus which allows for low-loss gigahertz devices. We demonstrate a diamond phononic waveguide platform for generating, guiding, and detecting gigahertz-frequency surface acoustic wave (SAW) phonons. We generate SAWs using interdigital transducers integrated on AlN/diamond and observe SAW transmission at 4-5 GHz through both ridge and suspended waveguides, with wavelength-scale cross sections (~1 {\mu}m2) to maximize spin-phonon interaction. This work is a crucial step for developing acoustic components for quantum phononic circuits with strain-sensitive color centers in diamond.
[PDF]
Marco Colangelo, Di Zhu, Linbo Shao, Jeffrey Holzgrafe, Emma K. Batson, Boris Desiatov, Owen Medeiros, Matthew Yeung, Marko Loncar, and Karl K. Berggren. 1/16/2024. “Molybdenum Silicide Superconducting Nanowire Single-Photon Detectors on Lithium Niobate Waveguides.” ACS Photonics. Publisher's VersionAbstract
We demonstrate a molybdenum silicide superconducting nanowire single-photon detector heterogeneously integrated onto a thin-film lithium niobate waveguide. The detector achieves approximately 50% on-chip detection efficiency at 1550 nm with a jitter of 82 ps when measured at 0.78 K. This demonstration showcases the integration of an amorphous superconductor utilizing conventional fabrication processes without strict cooling and substrate requirements. This paves the way for the integration of additional superconducting electronic components, potentially realizing the full promise of integrated quantum photonic circuits.
colangelo-et-al-2024-molybdenum-silicide-superconducting-nanowire-single-photon-detectors-on-lithium-niobate-waveguides.pdf
Eric Bersin, Matthew Grein, Madison Sutula, Ryan Murphy, Yan Qi Huan, Mark Stevens, Aziza Suleymanzade, Catherine Lee, Ralf Riedinger, David J Starling, Pieter-Jan Stas, Can M Knaut, Neil Sinclair, Daniel R Assumpcao, Yan-Cheng Wei, Erik N Knall, David S Levonian, Mihir K Bhaskar, Marko Lončar, Scott Hamilton, Mikhail Lukin, Dirk Englund, and Benjamin P Dixon. 1/8/2024. “Development of a Boston-area 50-km fiber quantum network testbed.” PHYSICAL REVIEW APPLIED, 21, Pp. 014024 . Publisher's VersionAbstract
Distributing quantum information between remote systems will necessitate the integration of emerging quantum components with existing communication infrastructure. This requires understanding the channel-induced degradations of the transmitted quantum signals, beyond the typical characterization methods for classical communication systems. Here we report on a comprehensive characterization of a Boston-Area Quantum Network (BARQNET) telecom fiber testbed, measuring the time-of-flight, polarization, and phase noise imparted on transmitted signals. We further design and demonstrate a compensation system that is both resilient to these noise sources and compatible with integration of emerging quantum memory components on the deployed link. These results have utility for future work on the BARQNET as well as other quantum network testbeds in development, enabling near-term quantum networking demonstrations and informing what areas of technology development will be most impactful in advancing future system capabilities.
[PDF]

Pages