Article
Optics
Joel F. Tasker, Jonathan Frazer, Giacomo Ferranti, Euan J. Allen, Leandre F. Brunel, Sebastien Tanzilli, Virginia D'Auria, Jonathan C. F. Matthews
Summary: By combining CMOS-compatible silicon and germanium-on-silicon nanophotonics with silicon-germanium integrated amplification electronics, this study enhances the speed performance of quantum light measurement and provides fast, multipurpose homodyne detectors for continuous-variable quantum optics.
Article
Optics
Yun-Feng Guo, Wei Zhong, Lan Zhou, Yu-Bo Sheng
Summary: The sensitivity of Kerr nonlinear phase estimation in a Mach-Zehnder interferometer with two-mode squeezed vacuum states is investigated, showing potential to surpass current sensitivity limits and exhibit superior performance with probe states of fluctuating photon numbers.
Article
Physics, Multidisciplinary
Zhi-Yuan Wang, Zi-Jing Zhang, Yuan Zhao
Summary: This paper proposes a scheme for precise measurement of tiny Doppler shifts using parametric amplification process and squeezed vacuum state, which can exceed the Cramer-Rao bound of coherent light. Simulation results show that under specific parameters, the measurement error of Doppler frequency shifts can be controlled within 14.4% of the original limit.
Article
Optics
Hiroko Tomoda, Takato Yoshida, Takahiro Kashiwazaki, Takeshi Umeki, Yutaro Enomoto, Shuntaro Takeda
Summary: One of the leading approaches to large-scale quantum information processing is the continuous-variable scheme based on time multiplexing. Conventional CV TM experiments have used fixed light sources that can only output squeezed pulses with the same squeezing levels and phases. However, we demonstrate a programmable time-multiplexed squeezed light source that can generate sequential squeezed pulses with various squeezing levels and phases at a time interval below 100 ns. This light source enables arbitrary generation patterns through software, without changing its hardware configuration. It is expected to implement various large-scale CV QIP tasks.
Article
Physics, Multidisciplinary
Huan Zhang, Wei Ye, Shoukang Chang, Ying Xia, Liyun Hu, Zeyang Liao
Summary: We propose a method to generate multi-mode entangled catalysis squeezed vacuum states (MECSVS) by embedding cross-Kerr nonlinear medium into a Mach-Zehnder interferometer, which realizes quantum state exchange between different modes based on Fredkin gate. Furthermore, we study MECSVS as the probe state of a multi-arm optical interferometer to achieve simultaneous multi-phase estimation. The results show that the quantum Cramer-Rao bound (QCRB) of phase estimation can be improved by increasing the number of catalytic photons or decreasing the transmissivity of the optical beam splitter used for photon catalysis. Additionally, our photon catalysis scheme exhibits lower QCRB than ideal entangled squeezed vacuum states (ESVS) even in the presence of photon loss, demonstrating its robustness against photon loss compared to schemes without catalysis. These results have potential applications in quantum metrology for multiparameter estimation.
FRONTIERS OF PHYSICS
(2023)
Article
Optics
Ruo-Jing Ren, Yong-Heng Lu, Ze-Kun Jiang, Jun Gao, Wen-Hao Zhou, Yao Wang, Zhi-Qiang Jiao, Xiao-Wei Wang, Alexander S. Solntsev, Xian-Min Jin
Summary: Integrated photonics offers new opportunities for topologically protected squeezed light on a chip, opening novel approaches for the design of quantum integrated photonics.
PHOTONICS RESEARCH
(2022)
Article
Optics
Doudou Wang, Quansen Wang, Qiang Zhang, Yongmin Li
Summary: We propose an ultrasensitive displacement measurement scheme to overcome the standard quantum limit (SQL) in the unresolved sideband cavity optomechanical system with nonlinear optomechanical coupling and squeezed light injection. By introducing the optimized quantum correlation, which is enabled by suitable choices of the squeezing angle, squeezing level, power of the probe light, and measurement angle of homodyne detection, the off-resonant displacement sensitivity reaches 6 dB below the SQL in linear optomechanical coupling. Our results have potential applications in gravitational-wave detectors, quantum metrology, and the search for dark matter.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2023)
Article
Physics, Multidisciplinary
Lorenzo Magrini, Victor A. Camarena-Chavez, Constanze Bach, Aisling Johnson, Markus Aspelmeyer
Summary: In this experiment, optical squeezing is observed by measuring the position of an optically levitated nanoparticle at room temperature without the use of an optical cavity. The noise is reduced by 9% +/- 0.5% below shot noise level. This experiment provides a novel, cavityless platform for enhanced sensing with squeezed light, and suggests a clear and simple strategy for observing stationary optomechanical entanglement.
PHYSICAL REVIEW LETTERS
(2022)
Article
Optics
Dongmei Han, Na Wang, Meihong Wang, Zhongzhong Qin, Xiaolong Su
Summary: In this study, we experimentally demonstrate the remote preparation and manipulation of squeezed light, verifying the effectiveness of the entanglement-based model and indicating potential applications in remote quantum information processing.
Article
Physics, Multidisciplinary
Yusuf Turek, Akbar Islam, Ahmad Abliz
Summary: In this work, the measurement transition and precision measurement advantages of single-photon-added coherent state after postselected von Neumann measurement are investigated. It is found that the weak-to-strong measurement transition occurs continuously by controlling a dimensionless parameter associated with system-pointer coupling. The study shows that the single-photon-added coherent pointer state can improve the precision of measurement processes such as signal-to-noise ratio and parameter estimation after postselected von Neumann measurement.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Multidisciplinary Sciences
Konstantin Dorfman, Shengshuai Liu, Yanbo Lou, Tianxiang Wei, Jietai Jing, Frank Schlawin, Shaul Mukamel
Summary: The study focuses on utilizing four-wave mixing (FWM) to generate a pair of squeezed beams in hot Rb vapor and measuring the two-dimensional quantum noise intensity difference spectra. The measurement provides higher spectral resolution compared to classical measurements and reveals details of x(3) susceptibility dressed by a strong pump field inducing an AC Stark shift. The quantum correlations of squeezed light are shown to be a robust spectroscopic tool resistant to external noise, unlike classical counterparts.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Computer Science, Information Systems
Jiying Zhang, Shan Wu, Yongchang Zhang, Zhengwei Zhou
Summary: The proposed scheme uses Uhrig dynamical decoupling to generate two-axis countertwisting squeezed spin states from a one-axis twisting Hamiltonian, significantly reducing the number of control pulses or required evolution time compared to previous proposals. The minimum number of applied pulses changes almost linearly relative to the spin number.
SCIENCE CHINA-INFORMATION SCIENCES
(2021)
Article
Optics
Jun Li, Chengjie Zhu, Yaping Yang
Summary: In this study, we propose the generation of squeezed light accompanied by hyperradiance through quantum interference in a linear system consisting of a high-quality optical cavity and two coherently driven two-level qubits. The results demonstrate that squeezed light can be generated in the hyperradiance regime under the conditions of strong coupling and weak driving, and the orthogonal angles of the squeezed light can be controlled by adjusting the frequency detuning between the driving field and the qubits.
Article
Optics
Jonas Junker, Dennis Wilken, Elanor Huntington, Michele Heurs
Summary: This article presents a novel spectroscopy technique that improves the signal-to-shot-noise ratio without increasing laser power by using frequency-modulation techniques and non-classical states of light. Experimentally, small signals at Hz to kHz frequencies below the shot noise limit were detected, supported by theoretical calculations. The proposed technique is potentially useful for applications such as high-precision cavity spectroscopy.
Article
Optics
Tiphaine Kouadou, F. Sansavini, M. Ansquer, J. Henaff, N. Treps, V. Parigi
Summary: This article explores the application of spectral- and time-multiplexing in generating large multipartite quantum states of light for quantum technologies. In the continuous variable approach, the generation of scalable entangled states requires the generation of a scalable number of squeezed modes. The study demonstrates the simultaneous generation of 21 squeezed spectral modes at a repetition rate of 156 MHz, utilizing the full repetition rate and pulse shaping of a femtosecond light source to combine frequency- and time-multiplexing in multimode squeezing. This development paves the way for scalable and fully reconfigurable multipartite entangled states.
Article
Physics, Multidisciplinary
A. McDonald, A. A. Clerk
Summary: In this paper, we demonstrate how the presence of continuous weak symmetry can be used to analytically diagonalize the Liouvillian of a class of Markovian dissipative systems with strong interactions or nonlinearity. This method enables an exact description of the full dynamics and dissipative spectrum, providing a powerful new tool for the study of complex driven-dissipative quantum systems.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Peter Groszkowski, Martin Koppenhoefer, Hoi-Kwan Lau, A. A. Clerk
Summary: This article revisits the dissipative approach to producing and stabilizing spin-squeezed states and provides a detailed analysis of two surprising features of such protocols: the macroscopic sensitivity of the steady state to the parity of N and the anomalous long timescale and prethermalized regime observed in weak single-spin dephasing. It also proposes a general hybrid-systems approach that can implement dissipative spin squeezing without requiring squeezed input light or complex multilevel atoms.
Article
Physics, Applied
Kenneth Rudinger, Guilhem J. Ribeill, Luke C. G. Govia, Matthew Ware, Erik Nielsen, Kevin Young, Thomas A. Ohki, Robin Blume-Kohout, Timothy Proctor
Summary: Midcircuit measurements are an important primitive in quantum computing, especially for quantum error correction. In this study, we used quantum instrument linear gate set tomography (QILGST) technique to characterize dispersive measurements on a superconducting Transmon qubit and investigate the impact of residual cavity photon population on measurement error.
PHYSICAL REVIEW APPLIED
(2022)
Article
Physics, Multidisciplinary
Vincent Dumont, Hoi-Kwan Lau, Aashish A. Clerk, Jack C. Sankey
Summary: As optomechanics progresses, quadratic dispersive coupling is seen as a feasible path, but some geometries lead to detrimental noise. This paper proposes a geometry that reduces noise without affecting the strength of QDC, highlighting advantages in optical levitation and phonon measurement.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
David Roberts, A. A. Clerk
Summary: We present an exact solution for the steady states of a class of quantum driven-dissipative bosonic models. Our solutions reveal the emergence of dissipative phase transitions, nontrivial mode competition physics, symmetry breaking, and the stabilization of many-body SU(1,1) pair-coherent states. These exact solutions are able to describe spatial correlations and are valid in regimes where traditional mean-field and semiclassical approaches break down.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Martin Koppenhoefer, Carl Padgett, Jeffrey Cady, Viraj Dharod, Hyunseok Oh, Ania C. Bleszynski Jayich, A. A. Clerk
Summary: Solid-state spin defects can be used as quantum sensors for various sensing targets, with some defects coupling to strain in the host material. This strain coupling can be utilized for mechanically mediated dispersive single-shot spin readout using optomechanically induced transparency measurement. Surprisingly, the estimated measurement times for negatively charged silicon-vacancy defects in diamond are much shorter than those for single-shot optical fluorescence readout. This scheme can also be applied for general parameter-estimation metrology and offers higher sensitivity than conventional schemes using continuous position detection.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Applied
F. Setiawan, Peter Groszkowski, Aashish A. Clerk
Summary: This paper proposes a general scheme to realize robust geometric two-qubit gates in multilevel qubit systems, where the interaction between the qubits is mediated by an auxiliary system. The scheme utilizes stimulated Raman adiabatic passage (STIRAP) and is simpler than existing STIRAP-based gates for atomic platforms. The gate can also be accelerated using a shortcuts-to-adiabaticity approach, achieving both speed and robustness.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Multidisciplinary
T. Noh, Z. Xiao, X. Y. Jin, K. Cicak, E. Doucet, J. Aumentado, L. C. G. Govia, L. Ranzani, A. Kamal, R. W. Simmonds
Summary: Efficient control and measurement of qubits can be achieved by using parametric driving to introduce and remove interactions. This study demonstrates a design that couples two transmon qubits to a cavity using a shared SQUID, enabling independent tuning of each qubit's interaction with the cavity. The results show promising potential for various future applications in cavity QED.
Article
Quantum Science & Technology
Yu-Xin Wang, Chen Wang, Aashish A. Clerk
Summary: This article presents a new approach for obtaining nonreciprocal quantum interactions that is different from traditional cascaded quantum systems and does not require breaking time-reversal symmetry. This method is based on the local gauge symmetry in any Markovian Lindblad master equation and can be used to perform dissipative steady-state unitary gate operations on a target quantum system. The article also introduces a new, highly general quantum-information-based metric for quantifying quantum nonreciprocity.
Article
Optics
Moein Malekakhlagh, Easwar Magesan, Luke C. G. Govia
Summary: In this study, a time-dependent perturbation theory is developed to investigate the effective interactions of driven open quantum systems. The method is applied to the dispersive readout of a transmon qubit and provides an effective map describing measurement-induced effects. The results are in good agreement with previous studies and numerical computations.
Article
Physics, Multidisciplinary
W. D. Kalfus, G. J. Ribeill, G. E. Rowlands, H. K. Krovi, T. A. Ohki, L. C. G. Govia
Summary: Using reservoir computing can overcome the challenges of high-fidelity control in quantum computation by leveraging complex internal trajectories in quantum systems as computational resources, resulting in performance improvement and advantages. The practical implementation of quantum reservoirs using current-era quantum hardware shows feasibility and promising outlook for increased performance in larger systems.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Physics, Multidisciplinary
L. C. G. Govia, A. Lingenfelter, A. A. Clerk
Summary: It is found in this study that the exotic phenomena of interaction between qubits and squeezed vacuum environment can be simulated by interfering excitation and decay processes without nonclassical light. The researchers propose schemes to stabilize entanglement between two remote qubits by modulating the qubit-waveguide coupling or directly driving the qubits, and analyze the robustness of these approaches and the trade-off between the speed and quality of entanglement stabilization.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Engineering, Electrical & Electronic
L. C. G. Govia, G. J. Ribeill, G. E. Rowlands, T. A. Ohki
Summary: The nascent computational paradigm of quantum reservoir computing shows potential in using near-term, noisy-intermediate-scale quantum processors. This study focuses on understanding the input encoding component of contemporary quantum reservoir computing schemes using a conceptual framework. The findings question the necessity and function of further processing after input, impacting the design of future quantum reservoirs and interpretation of results.
NEUROMORPHIC COMPUTING AND ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
A. McDonald, R. Hanai, A. A. Clerk
Summary: This paper demonstrates how generic non-Hermitian tight-binding lattice models can be achieved in an unconditional, quantum-mechanically consistent manner by constructing an appropriate open quantum system. It focuses on the quantum steady states of such models for both fermionic and bosonic systems, revealing their sensitivity to boundary conditions and the differences in steady-state density distribution between fermions and bosons.
Article
Physics, Multidisciplinary
Peter Groszkowski, Martin Koppenhofer, Hoi-Kwan Lau, A. A. Clerk
Summary: We revisit the dissipative approach to producing and stabilizing spin-squeezed states of an ensemble of N two-level systems, providing a detailed analysis of two surprising yet generic features of such protocols. The first feature is the macroscopic sensitivity of the steady state to whether N is even or odd. The second feature is the anomalous emergent long timescale and prethermalized regime that occurs for even weak single-spin dephasing. We also discuss a general hybrid-systems approach for implementing dissipative spin squeezing that does not require squeezed input light or complex multilevel atoms.
