Article
Optics
Yatan Xiong, Jiaqi Zhou, Xinru Cao, Shuzhen Cui, Huawei Jiang, Yan Feng
Summary: This study introduces a high-gain, narrowband, all-polarization-maintaining fiber Brillouin amplifier to address the low power issue of single lines in optical frequency combs (OFCs). Numerical simulations and experiments are conducted to investigate the amplification process for an individual OFC line. The study demonstrates the direct generation of a Watt-level single-mode laser from an OFC, achieving the highest power, signal-to-noise ratio, and side-mode-suppression ratio reported to date.
LASER & PHOTONICS REVIEWS
(2023)
Article
Quantum Science & Technology
Xinchao Ruan, Sha Xiong, Hang Zhang, Qingquan Peng, Ying Guo
Summary: In this paper, a traveling quantum anonymous voting (TQAV) protocol is proposed, which utilizes a monolithic microresonator with cascaded four-wave mixing (FWM) to prepare continuous-variable frequency entanglement sources. Multi-pair EPR entangled states and five-partite entangled states generated from the degenerate and nondegenerate FWM process are used as signal sources to characterize different candidates. Voters can vote for their preferred candidates by performing displacement operations on the received modes, and the ballot agency can judge the result according to the measurements. The entanglement property of the quantum state is utilized to ensure voter privacy, and the security of the protocol is guaranteed by the security mechanism of continuous-variable quantum key distribution. The results provide a reference for the application of optical frequency comb in multiparty quantum communication.
QUANTUM INFORMATION PROCESSING
(2023)
News Item
Physics, Multidisciplinary
Simone Gasparinetti
Summary: The emission of light from qubits in a superconducting circuit can be controlled to determine the direction of photon propagation, allowing for information routing in quantum networks.
Article
Quantum Science & Technology
Yao Tang, Tao Shang, Jianwei Liu
Summary: This article proposes a universal construction method for a full quantum one-way function, addressing the threat of quantum computers to traditional one-way functions. The new full quantum one-way function can directly transform information between quantum systems and is more suitable for quantum cryptographic schemes. It is beneficial for the security of quantum message authentication.
QUANTUM INFORMATION PROCESSING
(2022)
Article
Optics
Yaohu Cui, Zixiong Wang, Xunhe Zuo, Yitong Xu, Yang Jiang, Jinlong Yu, Zhanhua Huang
Summary: In this work, a novel approach to generate flat optical frequency comb (OFC) using dual-parallel Mach-Zehnder modulator (DPMZM) and superposed harmonics is proposed. The superposed harmonics only drive one child Mach-Zehnder modulator of the DPMZM, and by precisely adjusting the modulation indices, phases, and biases, flat OFCs are generated. In the experiment, a 9-line OFC with 0.26-dB flatness is achieved using the superposed fundamental tone and third harmonic to drive the DPMZM; a 13-line OFC with 0.58-dB flatness is achieved when the fundamental tone, the second harmonic, and the third harmonic simultaneously drive the DPMZM.
OPTICS COMMUNICATIONS
(2023)
Article
Optics
Jia-Jian Chen, Wen-Qi Wei, Jia-Le Qin, Bo Yang, Jing-Zhi Huang, Zi-Hao Wang, Ting Wang, Chang-Yuan Yu, Jian-Jun Zhang
Summary: Multi-wavelength injection locked lasers have been demonstrated on silicon substrates, showing narrow optical linewidths and stable operation, highlighting their great potential as tunable on-chip multi-wavelength light sources.
PHOTONICS RESEARCH
(2022)
Article
Engineering, Electrical & Electronic
Hilmi Othman, Xing Ouyang, Cleitus Antony, Frank Smyth, Paul D. Townsend
Summary: The spectrally-sliced coherent receiver offers a cost-effective solution for optical access networks. It allows for reduced bandwidth of analog front-end components and analog-to-digital convertors compared to traditional intradyne coherent receivers. In this experimental study, we achieved a single-polarization 50 Gb/s QPSK C-band transmission over 40 km of standard fiber using receiver bandwidths as low as 6.25 GHz. The use of an array of local oscillator lines derived from an injection locked gain-switched optical frequency comb demonstrates the potential for a compact photonic integrated circuit. The results show that, with practical comb parameter values, the receiver can operate with less than a 1 dB sensitivity penalty compared to a conventional intradyne receiver, making it a promising solution for next-generation access networks.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Physics, Applied
Shujie Pan, Hongguang Zhang, Zizhuo Liu, Mengya Liao, Mingchu Tang, Dingyi Wu, Xiao Hu, Jie Yan, Lei Wang, Mingchen Guo, Zihao Wang, Ting Wang, Peter M. Smowton, Alwyn Seeds, Huiyun Liu, Xi Xiao, Siming Chen
Summary: In this work, a passive two-section InAs/InGaAs quantum-dot (QD) MLL-based OFC with a fundamental repetition rate of around 100 GHz operating at O-band wavelength range is presented. The device is specially designed to generate nearly Fourier-transform-limited pulses in the entire test range by only pumping the gain section while with the absorber unbiased. The experimental results demonstrate the feasibility of InAs QD MLLs as a simple structure, easy operation, and low power consumption OFC sources for high-speed fibre-optic communications.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
Xiangrui Li, Aijun Wen, Xiaoyang Li, Hao Zhuo, Jianzhang Zhao
Summary: A disambiguation method for dual-comb sampling frequency measurement is proposed and experimentally demonstrated. By exploiting the phase relationship between the intermediate frequencies and the first harmonics of the two sampling rates, most of the ambiguous frequencies can be distinguished. The nonideal phase response of the devices is found to reduce the performance, especially in high frequencies. An improved method that observes and uses the variations of the phases to solve the ambiguity is given to overcome this issue.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Weicheng Chen, Rongxiang Guo, Dian Wan, Tarun Sharma, Lin Zhang, Tiegen Liu, Zhenzhou Cheng
Summary: On-chip Kerr frequency combs provide unprecedented opportunities for optical communications and optical interconnects with compact, low-cost, and high-density wavelength-division multiplexing (WDM) techniques. A dual-mode Kerr frequency comb based on a graphene-on-silicon (GOS) microring is proposed to overcome the limitation of traditional approaches and achieve high-speed optical communications.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2022)
Article
Optics
Najm M. Al-Hosiny
Summary: We numerically investigate the dynamics of frequency shifts in semiconductor lasers under the injection of a frequency comb. The effect of comb spacing on the locking bandwidth is studied, and it is found to play an important role in the boundaries of the locking bandwidth as well as in the frequency shift of the SL peak.
Article
Engineering, Electrical & Electronic
Ji-Liang Wu, Xiaohui Guo, Yadong Jiao, Xucheng Zhang, Ting Wang, Yue-De Yang, Jin-Long Xiao, Daming Zhang, Guanshi Qin, Yong-Zhen Huang
Summary: In this study, an octave-spanning 10-GHz optical comb is achieved using a directly-modulated microlaser, and the optical pulse width is further reduced to 140 fs in a fiber through optimal chirp compensation.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Physics, Multidisciplinary
Xiao-Wei Wang, Wen-Hao Zhou, Yu-Xuan Fu, Jun Gao, Yong-Heng Lu, Yi-Jun Chang, Lu-Feng Qiao, Ruo-Jing Ren, Ze-Kun Jiang, Zhi-Qiang Jiao, Georgios M. Nikolopoulos, Xian-Min Jin
Summary: Through experiments, we demonstrate that the implementation of a cryptographic one-way function based on coarse-grained boson sampling in a photonic boson-sampling machine requires a moderate sample size, much smaller than predicted by the Chernoff bound. Nonboson samplers cannot generate the same output for numbers of photons n >= 3 and bins d similar to poly(m, n). Our study is the first experimental exploration of the potential applications of boson sampling in cryptography and paves the way for further research in this direction.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Applied
Takeshi Kondo, Seiho Shindo, Daisuke Yoshida, Yuma Goji, Mikitaka Nishihara, Taiki Aizawa, Feng-Lei Hong, Tomoyuki Horiki
Summary: A narrow-linewidth optical frequency comb is developed for frequency stabilization in order to couple telecommunication wavelength photons with quantum memories. Phase-locking to an iodine-stabilized Nd:YAG laser is used to achieve frequency stabilization in the developed optical frequency comb. The control laser of a Pr3+:Y2SiO5 (Pr:YSO) quantum memory is then phase-locked to the optical frequency comb, allowing for sufficient linewidth and frequency stability for multimode storage in the Pr:YSO quantum memory.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
Chawaphon Prayoonyong, Andreas Boes, Xingyuan Xu, Mengxi Tan, Sai T. Chu, Brent E. Little, Roberto Morandotti, Arnan Mitchell, David J. Moss, Bill Corcoran
Summary: The research team demonstrated wideband noise reduction for optical frequency comb lines using high-Q microring resonators, effectively reducing the number of comb lines required for the optical signal-to-noise ratio, improving the performance of optical communication systems.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Quantum Science & Technology
J. Eli Bourassa, Rafael N. Alexander, Michael Vasmer, Ashlesha Patil, Ilan Tzitrin, Takaya Matsuura, Daiqin Su, Ben Q. Baragiola, Saikat Guha, Guillaume Dauphinais, Krishna K. Sabapathy, Nicolas C. Menicucci, Ish Dhand
Summary: The proposal introduces a scalable fault-tolerant photonic quantum computer design that utilizes the generation and manipulation of three-dimensional resource states comprising bosonic qubits and squeezed vacuum states. It incorporates state-of-the-art procedures for generating bosonic qubits and squeezed states, along with utilizing a two-dimensional integrated photonic chip to produce qubit cluster states in temporal and spatial dimensions.
Article
Multidisciplinary Sciences
J. Pablo Bonilla Ataides, David K. Tuckett, Stephen D. Bartlett, Steven T. Flammia, Benjamin J. Brown
Summary: Research shows that using the XZZX code for fault-tolerant quantum computation offers remarkable performance and can surpass the hashing bound in experimentally relevant noise parameters. In cases where qubit dephasing is the dominant noise, this code has a practical decoder and exceeds previous thresholds. The code demonstrates favorable sub-threshold resource scaling and maintains advantages when performing fault-tolerant quantum computation, showing better performance and requiring fewer resources compared to the surface code.
NATURE COMMUNICATIONS
(2021)
Article
Quantum Science & Technology
Steven T. Flammia, Ryan O'Donnell
Summary: This study focuses on learning a Pauli channel or the Pauli error rates of an arbitrary channel, and proposes a simple algorithm using unentangled state preparation and measurements. The algorithm is impervious to limited model of measurement noise, and can achieve higher precision when the noise channel is close to the identity matrix.
Article
Quantum Science & Technology
Miller Eaton, Carlos Gonzalez-Arciniegas, Rafael N. Alexander, Nicolas C. Menicucci, Olivier Pfister
Summary: The article presents an algorithm for reliably generating various quantum states critical to quantum error correction and universal continuous-variable (CV) quantum computing from Gaussian CV cluster states. The algorithm utilizes the Photon-counting-Assisted NodeTeleportation Method (PhANTM), which employs standard Gaussian information processing with the addition of local photon-number-resolving measurements. The method can stabilize cat states against Gaussian noise and maintain non-Gaussianity within the cluster. Existing protocols for breeding cat states can be embedded into cluster-state processing using PhANTM.
Article
Physics, Multidisciplinary
Qian Xu, Nam Mannucci, Alireza Seif, Aleksander Kubica, Steven T. Flammia, Liang Jiang
Summary: Quantum error correction (QEC) for generic errors is challenging, but when physical noise is biased, tailored QEC schemes can improve performance. In this study, we explored XZZX codes that are highly efficient if tailored to biased noise. By using the notion of effective distance, we found that the XZZX codes achieve favorable resource scaling and remarkably high thresholds, while also being efficiently decoded. Additionally, these codes can realize fault-tolerant QEC with a large effective distance by adding only one flag qubit.
PHYSICAL REVIEW RESEARCH
(2023)
Review
Physics, Applied
Andreas Elben, Steven T. Flammia, Hsin-Yuan Huang, Richard Kueng, John Preskill, Benoit Vermersch, Peter Zoller
Summary: Programmable quantum simulators and computers provide unprecedented opportunities for exploring complex quantum systems. Measurement protocols that involve randomization have advantages such as reusing data sets for multiple applications and mitigating imperfections. These protocols have been used to realize a range of tasks in quantum devices, including simulation, chaos probing, order parameter measurement, and state comparison. The randomized measurement toolbox strengthens our ability to understand and control the quantum world by translating complex quantum states into simpler classical representations.
NATURE REVIEWS PHYSICS
(2023)
Article
Quantum Science & Technology
Adrian Chapman, Steven T. Flammia, Alicia J. Kollar
Summary: In this work, we consider quantum error-correcting subsystem codes with gauge generators that realize a translation-invariant, free-fermion-solvable spin model. We provide methods for embedding a given frustration graph in the anticommutation relations of a spin model and present an exactly solvable spin model with a two-dimensional free-fermion description and exact topological qubits. We also examine the energetics of these solvable models from a graph-theoretic perspective and numerically search for models with large spectral gaps for robust thermal suppression of errors.
Article
Quantum Science & Technology
Christopher Chamberland, Kyungjoo Noh, Patricio Arrangoiz-Arriola, Earl T. Campbell, Connor T. Hann, Joseph Iverson, Harald Putterman, Thomas C. Bohdanowicz, Steven T. Flammia, Andrew Keller, Gil Refael, John Preskill, Liang Jiang, Amir H. Safavi-Naeini, Oskar Painter, Fernando G. S. L. Brandao
Summary: This paper presents a comprehensive architectural analysis for a fault-tolerant quantum computer based on cat codes combined with outer quantum error-correcting codes. The hardware proposed is a system of acoustic resonators coupled to superconducting circuits with a two-dimensional layout. Through detailed error analysis and numerical simulations, realistic estimates of the physical error rates and overheads needed to run fault-tolerant quantum algorithms are obtained. The study finds that with around 1000 superconducting circuit components, it is possible to construct a fault-tolerant quantum computer capable of running circuits currently intractable for classical computers.
Article
Optics
Blayney W. Walshe, Rafael N. Alexander, Nicolas C. Menicucci, Ben Q. Baragiola
Summary: Continuous-variable cluster states combined with GKP encoding enable fault-tolerant measurement-based quantum computing. For quad-raillattice macronode cluster states, a Clifford gate and GKP error correction can be simultaneously implemented in a single teleportation step. Logical error rates compatible with the thresholds of topological codes can be achieved with finite squeezing in the resources.
Article
Quantum Science & Technology
Ilan Tzitrin, Takaya Matsuura, Rafael N. Alexander, Guillaume Dauphinais, J. Eli Bourassa, Krishna K. Sabapathy, Nicolas C. Menicucci, Ish Dhand
Summary: This work proposes a topologically error-corrected architecture for photonic quantum computing based on Gottesman-Kitaev-Preskill (GKP) qubits, which reduces the state preparation overheads and accelerates the construction of a photonic quantum computer. The proposed circuit's symmetry allows for a more comprehensive threshold estimates by combining the effects of finite squeezing and uniform photon loss within the noise model.
Article
Astronomy & Astrophysics
Scott L. Todd, Giacomo Pantaleoni, Valentina Baccetti, Nicolas C. Menicucci
Summary: The study investigates a simple toy model of particle scattering in the flat spacetime limit of an analogue-gravity model. By performing a sonic analogue to Compton scattering, in-universe observers can determine if they are in motion with respect to their medium and find their velocity with respect to the medium. Through the interaction between the phonon field and the external particle, the Lorentz symmetry of the speed of sound in the medium is explored.
Article
Quantum Science & Technology
Senrui Chen, Wenjun Yu, Pei Zeng, Steven T. Flammia
Summary: The study presents an efficient and noise-resilient protocol for learning properties of quantum states, which can effectively characterize and mitigate noise interference in the shadow estimation scheme, suitable for current experimental conditions, with good sampling efficiency and noise resilience.
Article
Optics
Lucas J. Mensen, Ben Q. Baragiola, Nicolas C. Menicucci
Summary: The paper introduces a toolkit for phase-space description and manipulation of GKP encodings, allowing for description and manipulation of various types of GKP states and operators. Utilizing phase space simplifies Gaussian unitaries operations, including error correction and magic-state preparation for GKP encodings.
Article
Optics
Giacomo Pantaleoni, Ben Q. Baragiola, Nicolas C. Menicucci
Summary: The study reveals that continuous-variable cluster states and GKP states contain hidden qubit cluster states, making them very useful in measurement-based quantum computing. By decomposing modes into logical and gauge-mode subsystems and using a simple graphical description, the interaction between these cluster states can be better understood.
Article
Optics
Giacomo Pantaleoni, Ben Q. Baragiola, Nicolas C. Menicucci
Summary: The researchers utilize subsystem decomposition to analyze the encoded logical information in CV cluster-state quantum computing with GKP states. They decompose squeezed-vacuum states and approximate GKP states to reveal their logical information, and quantify damage to the logical information in approximate GKP states teleported through noisy CV cluster states. This approach allows them to focus on the encoded qubit information despite the complexities of the full CV nature of the mode.
