Article
Quantum Science & Technology
Wei Ye, Ying Guo, Huan Zhang, Shoukang Chang, Ying Xia, Sha Xiong, Liyun Hu
Summary: We propose a theoretical scheme for generating a novel kind of non-Gaussian state by using coherent superposition of photon subtraction and addition on each mode of an input two-mode squeezed coherent state. The simulation results showed that the increase in coherent amplitudes of the CS-based TMSC is beneficial for improving the nonclassicality compared to the TMSC case. We also analyze the entanglement of the proposed CS-based TMSC and its applications in quantum teleportation. The proposed state demonstrates distinct advantages over other non-Gaussian states in terms of optimal entanglement and fidelity at small-initial squeezing ranges.
QUANTUM INFORMATION PROCESSING
(2023)
Article
Optics
Kosuke Fukui, Mamoru Endo, Warit Asavanant, Atsushi Sakaguchi, Jun-ichi Yoshikawa, Akira Furusawa
Summary: This article introduces a method to generate optical GKP qubits using cross-Kerr interaction and validates its feasibility through numerical calculations. The results show that the method is capable of generating GKP qubits with the required quality, achieving high fidelity and success probability.
Article
Physics, Multidisciplinary
Ivan Derkach, Vladyslav C. Usenko
Summary: The study shows that achieving quantum key distribution over satellite channels requires stable setup and reduction of noise and loss, with the key extraction method significantly affecting protocol robustness. Optimized signal squeezing can substantially improve protocol applicability, reducing system clock rates and aperture sizes compared to coherent-state protocols.
Article
Physics, Multidisciplinary
Nezihe Uzun
Summary: The hydrodynamic interpretation of quantum mechanics is used to study squeezed coherent states by deriving phase space distribution, decomposing joint distribution, and tracking classical system evolution. The probability distributions satisfy Fokker-Planck equations and can be used to decompose equilibrium entropy. Quantum temperature, pressure, and internal energy are defined and a quantum conditional virial relation is suggested.
Article
Optics
Youke Xu, Shoukang Chang, Cunjin Liu, Liyun Hu, Sanqiu Liu
Summary: The phase sensitivity of the SU(1,1) interferometer was investigated, showing that the coefficient of coherent superposition can modulate performance, especially in small squeezing regions. Photon addition demonstrated the best robustness among non-Gaussian operations. For small squeezing, the first-order non-Gaussian operation may be the most preferred choice.
Article
Physics, Multidisciplinary
Feng-Xiao Sun, Sha-Sha Zheng, Yang Xiao, Qihuang Gong, Qiongyi He, Ke Xia
Summary: The study proposes a method to remotely prepare magnon cat states by performing non-Gaussian operations on the optical mode, resulting in high fidelity and nonclassicality of the cat states. This has potential applications in quantum technologies.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Luping Zhang, Fang Jia, Huan Zhang, Wei Ye, Ying Xia, Liyun Hu, Jiehui Huang
Summary: This study proposes a scheme for improving entanglement using number-conserving generalized superposition of products (GSP) operation. It is found that both single-mode and two-mode-symmetric GSP operations can effectively enhance entanglement. Compared to other non-Gaussian operations, this scheme shows better entanglement performance at a small amplitude level. In addition, when used for teleportation, this scheme achieves the optimal teleportation fidelity.
RESULTS IN PHYSICS
(2022)
Article
Optics
Timo Hillmann, Fernando Quijandria
Summary: Noise-biased qubits are a promising approach to reduce the hardware overhead of quantum error correction. The squeezed-cat code, which is a nonlocal encoding in phase space based on squeezed coherent states, exemplifies a noise-biased (bosonic) qubit with exponential error bias. In this study, we propose and analyze a dissipatively stabilized squeezed-cat qubit for error correction. Our findings show that moderate squeezing significantly reduces the bit-flip error rate compared to ordinary cat qubits, while the phase-flip rate remains unchanged. Furthermore, squeezing enables faster and higher fidelity gates.
Article
Optics
P. Neveu, J. Delpy, S. Liu, C. Banerjee, J. Lugani, F. Bretenaker, E. Brion, F. Goldfarb
Summary: A study demonstrated the generation of squeezed vacuum states of light using four wave mixing at room temperature, working at resonance with an atomic transition. Investigation into the properties of these states showed that the noise variances of the squeezed and anti-squeezed quadratures cannot be explained solely by losses. A theoretical model incorporating residual absorption and spontaneous emission provided an excellent agreement with experimental data without any adjusted parameter.
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
Evaldo M. F. Curado, Sofiane Faci, Jean-Pierre Gazeau, Diego Noguera
Summary: This study examines the conditions for state discrimination using squeezed coherent states and compares them with the conditions using standard coherent states. The minimum bound for quantum error probability, known as the Helstrom bound, is also considered.
Article
Multidisciplinary Sciences
M. Hays, V Fatemi, D. Bouman, J. Cerrillo, S. Diamond, K. Serniak, T. Connolly, P. Krogstrup, J. Nygard, A. Levy Yeyati, A. Geresdi, M. H. Devoret
Summary: Researchers combined the advantages of semiconductor spin qubits and superconducting electrodynamic qubits to create the Andreev spin qubit, achieving coherent spin manipulation and discovering spin-flip time and spin coherence time.
Article
Optics
A. Dehghani, B. Mojaveri, A. A. Alenabi
Summary: In this study, a new class of two-mode entangled nonlinear coherent-squeezed states (ENCSS) is proposed by substituting standard coherent states with nonlinear coherent states. Different types of non-linearity functions are employed to investigate the effectiveness of non-linearization of the ECSS. A general analysis of non-classical properties is presented and the entanglement of these states is discussed.
APPLIED PHYSICS B-LASERS AND OPTICS
(2022)
Article
Physics, Multidisciplinary
Jacob Hastrup, Kimin Park, Radim Filip, Ulrik Lund Andersen
Summary: A method is proposed for generating highly squeezed vacuum states with low excess antisqueezing using a few oscillator-qubit coupling gates through a Rabi-type interaction Hamiltonian, which can be implemented with different methods and is compatible with other protocols manipulating quantum harmonic oscillators.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Fluids & Plasmas
Urbashi Satpathi, Sayak Ray, Amichay Vardi
Summary: We study the interplay of chaos and tunneling between two weakly coupled Bose-Josephson junctions. The classical phase space of the composite system has a mixed structure, including quasi-integrable self-trapping islands separated by a chaotic sea. We show that the chaos-enhanced many-body dynamical tunneling gap between macroscopic Schrodinger cat states supported by these islands. The many-body tunneling rate fluctuates over several orders of magnitude with small variations of the system parameters or the particle number.
Article
Optics
Kimin Park, Petr Marek, Radim Filip
Article
Optics
Kimin Park, Petr Marek, Radim Filip
Article
Optics
L. Slodicka, P. Marek, R. Filip
Article
Optics
Michal Micuda, Robert Starek, Petr Marek, Martina Mikova, Ivo Straka, Miroslav Jezek, Toshiyuki Tashima, Sahin K. Ozdemir, Mark Tame
Article
Multidisciplinary Sciences
Kimin Park, Petr Marek, Radim Filip
SCIENTIFIC REPORTS
(2017)
Article
Physics, Multidisciplinary
Changhun Oh, Kimin Park, Radim Filip, Hyunseok Jeong, Petr Marek
NEW JOURNAL OF PHYSICS
(2020)
Article
Physics, Applied
Shunya Konno, Atsushi Sakaguchi, Warit Asavanant, Hisashi Ogawa, Masaya Kobayashi, Petr Marek, Radim Filip, Jun-ichi Yoshikawa, Akira Furusawa
Summary: In this paper, a superposition between a vacuum state and a single-photon state with maximized nonlinear squeezing is generated and observed in real-time quadrature measurements. This work presents an important step in extending continuous-variable quantum information processing from the Gaussian regime to the non-Gaussian regime.
PHYSICAL REVIEW APPLIED
(2021)
Article
Physics, Applied
Kimin Park, Changhun Oh, Radim Filip, Petr Marek
Summary: This study discovers that the same estimation results of quantum probes using entangled or quantum non-Gaussian states can be achieved in a significantly more feasible manner by employing independent sets of differently squeezed Gaussian states that are classically correlated with position or momentum measurements.
PHYSICAL REVIEW APPLIED
(2022)
Article
Physics, Multidisciplinary
Shunya Konno, Warit Asavanant, Kosuke Fukui, Atsushi Sakaguchi, Fumiya Hanamura, Petr Marek, Radim Filip, Jun-ichi Yoshikawa, Akira Furusawa
Summary: This paper explores the method of implementing non-Clifford operations on GKP qubits, achieving high-fidelity linear optical implementation by combining nonlinear feedforward and GKP-encoded ancillary states.
PHYSICAL REVIEW RESEARCH
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
R. Starek, M. Micuda, M. Mikova, I. Straka, M. Dusek, P. Marek, M. Jezek, J. Fiurasek
2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)
(2017)
Article
Optics
Petr Marek, Petr Zapletal, Radim Filip, Yosuke Hashimoto, Takeshi Toyama, Jun-ichi Yoshikawa, Kenzo Makino, Akira Furusawa
Article
Optics
Kimin Park, Petr Marek, Radim Filip
Article
Optics
Petr Marek, Lukas Lachman, Lukas Slodicka, Radim Filip
Article
Optics
Kimin Park, Petr Marek, Radim Filip
Article
Optics
Kazunori Miyata, Hisashi Ogawa, Petr Marek, Radim Filip, Hidehiro Yonezawa, Jun-ichi Yoshikawa, Akira Furusawa
