Article
Physics, Applied
Sabur A. Barbhuiya, Aranya B. Bhattacherjee
Summary: We theoretically study the non-linear behavior of a hybrid quantum magnomechanical system, where a superconducting qubit couples dispersively to a magnon-phonon mode. The interaction between the magnetic excitations and the mechanical vibrations of the system results in magnomechanically induced transparency in the system's output. The system exhibits sharp bistable frequency switching of the magnon-excitons under the dressed qubit anharmonicity.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Optics
Pavel Stransky, Pavel Cejnar, Radim Filip
Summary: In this study, a system of a single qubit interacting with a soft-mode bosonic field is analyzed, revealing a complex arrangement of quantum phase transitions in both the ground and excited states. The experimentally observable signature of some transitions is a dynamical stabilization of a fully factorized qubit-field state involving the field vacuum, particularly in the ultrastrong coupling regime. The degree of stabilization abruptly varies with interaction parameters and increases with the softness of the field mode, showing connections to various forms of excited-state quantum phase transitions.
Article
Mathematics
Dmitry Makarov
Summary: The coupled quantum harmonic oscillator, an important model system in quantum optics and quantum informatics, has been widely studied for quantum entanglement. This research demonstrates that the system of coupled harmonic oscillators interacting with two independent particles has an exact analytical solution to the dynamic Schrodinger equation, revealing the main parameters of the system.
Article
Physics, Multidisciplinary
Fazlollah Kazemi Hasanvand, Negar Naderi
Summary: The correlation dynamics of a non-interacting two-qubit system embedded in a qutrit environment with a constant magnetic field were investigated. It was found that the concurrence and discord can be controlled by adjusting the environment's degrees of freedom, coupling strength, and external magnetic field strength. Additionally, decoherence is inevitable, but total entanglement death can be avoided within certain parameter ranges.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Physics, Multidisciplinary
Y. Akbari-Kourbolagh, Z. Pazhotan
Summary: This study investigates the dynamics of entanglement in a hybrid non-interacting qubit-qutrit system under the influence of classical noises. The results show that the system exhibits different dynamics of entanglement depending on the configuration of classical noises.
INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS
(2022)
Article
Optics
Jin Liu, Yue-Hui Zhou, Jian Huang, Jin-Feng Huang, Jie-Qiao Liao
Summary: This study proposes a novel scheme for simulating a three-mode optomechanical system in the single-photon strong-coupling regime based on Fredkin-type interaction, demonstrating the generation of entangled cat states and investigating the quantum coherence effects and the influence of system dissipation on state generation. It opens up a new avenue for studying multimode optomechanical interactions at the single-photon level.
Article
Physics, Multidisciplinary
Tanmoy Bera, Sourav Majumder, Sudhir Kumar Sahu, Vibhor Singh
Summary: Researchers have demonstrated a hybrid device incorporating a superconducting transmon qubit and a mechanical resonator coupled using magnetic-flux. They showed a high vacuum electromechanical coupling rate and the enhancement of electromechanical coupling by tuning the qubit position, while observing specific interference features.
COMMUNICATIONS PHYSICS
(2021)
Article
Physics, Multidisciplinary
Ryuichi Ohta, Loic Herpin, Victor M. Bastidas, Takehiko Tawara, Hiroshi Yamaguchi, Hajime Okamoto
Summary: The study demonstrates a strain-mediated interaction between phonons and telecom photons using erbium ions in a mechanical resonator. Due to the long-lived nature of rare-earth ions, the dissipation rate of the optical resonance falls below that of the mechanical one, achieving a reversed dissipation regime in the optical frequency region. The interaction leads to stimulated excitation of erbium ions and the potential for single-photon strong coupling exceeding the dissipation rates of erbium and mechanical systems.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
Antti Vaaranta, Marco Cattaneo, Russell E. Lake
Summary: We investigate the dynamics of transmon qubits in the presence of noise from an impedance-matched resistor embedded in the qubit control line. By deriving the circuit Hamiltonian and utilizing the block diagonalization method, we obtain a quantitative description of the qubit decoherence rate and its dependence on the number of thermal photons in the readout resonator. Our findings reveal that increasing the dissipation rate of the resonator beyond the dispersive strong regime can lead to remarkably improved qubit decoherence rates.
Editorial Material
Physics, Multidisciplinary
Federico Levi
Summary: This article discusses what makes a good qubit.
Article
Multidisciplinary Sciences
Onat Arisoy, Ozgur E. Mustecaplioglu
Summary: In this study, a few-qubit system is proposed as a compact quantum refrigerator to cool an interacting multi-qubit system. By using a spin-star model to prepare refrigerant qubits, a collisional route to thermalization can effectively cool the many-qubit system. The operation cost and cooling efficiency of a simple refrigeration cycle can be controlled by parameters such as the number of ancilla qubits and the qubit-qubit interaction strength, and bounds on achievable temperature are established.
SCIENTIFIC REPORTS
(2021)
Article
Optics
Wei Zhang, Dong-Yang Wang, Cheng-Hua Bai, Tie Wang, Shou Zhang, Hong-Fu Wang
Summary: This study proposes a scheme to generate squeezed states of magnon and phonon modes and demonstrates the transfer of squeezing between modes of distinct frequencies in a cavity magnomechanical system. By activating the magnetostrictive force in the ferrimagnet, driven magnon mode can be prepared in a squeezed state and transferred to the cavity mode. Parameters for achieving large squeezing of magnons and phonons in different regimes are given as the principal feature of this scheme, which could potentially extend to hybrid optical systems and facilitate strong mechanical squeezing in cavity magnomechanical systems.
Article
Physics, Particles & Fields
Huan Yang, Ling-Ling Xing, Min Kong, Gang Zhang, Liu Ye
Summary: The principles of quantum information provide new avenues to investigate the cosmos. The uncertainty principle, an important trait of the nonclassical world, can be used to estimate measurement results. By using entropy and quantum memory, the uncertainty principle is generalized as quantum-memory-assisted entropic uncertainty relations. This study explores the effects of cosmic parameters on these relations and reveals the influence of the Holevo quantity.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Multidisciplinary Sciences
Dario Lago-Rivera, Jelena V. Rakonjac, Samuele Grandi, Hugues de Riedmatten
Summary: The researchers have successfully demonstrated long-distance quantum teleportation by transferring a photonic qubit to a solid-state quantum memory. They utilized time-multiplexing to increase the teleportation rate, and the system is compatible with existing telecommunication networks. This achievement is significant for the development of long-distance quantum communication.
NATURE COMMUNICATIONS
(2023)
Article
Optics
Arkaprabha Ghosal, Debarshi Das, Subhashish Banerjee
Summary: In this research, the efficacy of quantum resources for quantum teleportation were studied by considering the preparation of a pure two-qubit state and its transmission through a quantum channel. It was found that certain quantum channels have different effects on the utility of quantum teleportation depending on whether the initial state is maximally entangled or nonmaximally entangled. Additionally, nonunital channels were shown to be more effective than unital channels in producing useful states for universal quantum teleportation from nonmaximally entangled pure 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, 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
Quantum Science & Technology
Tian-Xing Zheng, Anran Li, Jude Rosen, Sisi Zhou, Martin Koppenhoefer, Ziqi Ma, Frederic T. T. Chong, Aashish A. Clerk, Liang Jiang, Peter C. Maurer
Summary: In this study, a variational method is developed to generate metrological states in small dipolar-interacting spin ensembles with limited qubit control. The generated states enable sensing beyond the standard quantum limit (SQL) and are applicable to finite spin polarization and non-Markovian noise environments.
NPJ QUANTUM INFORMATION
(2022)
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
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
Physics, Multidisciplinary
Changchun Zhong, Mingrui Xu, Aashish Clerk, Hong X. Tang, Liang Jiang
Summary: In this Letter, a new approach to enhance the quantum transduction capacity is proposed by relaxing the impedance matching condition through the introduction of two-photon drive in the electro-optic transducer. By analyzing interference patterns, it is found that the parameter regimes with positive quantum capacity can be identified.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Quantum Science & Technology
Martin Koppenhoefer, Peter Groszkowski, Hoi-Kwan Lau, A. A. Clerk
Summary: In this study, a dissipative spin-amplification protocol is proposed to improve the sensitivity of sensors based on ensembles of solid-state spins. The method allows for significant improvement in sensitivity even in the presence of realistic intrinsic dissipation and noise.
Article
Materials Science, Multidisciplinary
Andrew Pocklington, Yu-Xin Wang, Yariv Yanay, A. A. Clerk
Summary: The study analyzes a method for preparing and stabilizing volume-law entangled states with minimal resources and wide applicability. It is found that a unique pure entangled steady state exists under certain conditions, and can be applied to different experimental platforms.
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
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.
Article
Quantum Science & Technology
R. Dassonneville, R. Assouly, T. Peronnin, A. A. Clerk, A. Bienfait, B. Huard
Summary: This study overcomes the 3 dB squeezing limit in the intraresonator state by implementing a reservoir-engineering method using superconducting circuits, achieving squeezing as high as 8.2 +/- 0.8 dB with a purity of 0.91 +/- 0.09. The effective coupling to a squeezed bath stabilized the squeezed state inside the resonator, demonstrated by performing a direct Wigner tomography with a superconducting qubit as a probe.
