Article
Physics, Applied
Zheng-Yin Zhao, Xue-Xiang Xu
Summary: In this paper, we introduce the amplified thermal state (ATS) and study its properties such as light intensity, signal-to-noise ratio (SNR), Fock matrix elements, and Wigner function. We analyze the decoherence in photon-loss channel and find that amplification enhances non-Gaussianity while decoherence leads to a return to a Gaussian state.
MODERN PHYSICS LETTERS B
(2021)
Article
Optics
Filippus S. Roux
Summary: This article addresses the computational challenges associated with using Wigner functions to identify non-classical properties of states through the use of generating functions. The formal definition and experimental implementation of photon-subtracted states are analyzed, with demonstrations on squeezed thermal and squeezed Fock states. Generating functions are also utilized for photon statistics of these states, revealing various aspects of the parameter dependences.
Article
Optics
Chang Hoong Chow, Boon Long Ng, Christian Kurtsiefer
Summary: The study demonstrates the successful extension of qubit coherence time from microseconds to milliseconds using dynamic decoupling technique on optically trapped rubidium-87 atoms. The observed strong correlation between the motion states of the atom and qubit coherence after refocusing can be utilized for resolving trapping parameters.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2021)
Article
Optics
Dongmei Han, Fengxiao Sun, Na Wang, Yu Xiang, Meihong Wang, Mingsheng Tian, Qiongyi He, Xiaolong Su
Summary: Remote state preparation allows for the preparation and manipulation of quantum state non-locally. This study presents the experimental preparation of optical cat states remotely using a two-mode Gaussian entangled state in a lossy channel. The remote manipulation of the prepared cat state is demonstrated by changing the measurement basis at Alice's station. The results show the potential for remote hybrid quantum information processing.
LASER & PHOTONICS REVIEWS
(2023)
Article
Physics, Multidisciplinary
Deepak, Arpita Chatterjee
Summary: In this paper, the higher and lower-order nonclassicalities of photon-added then-subtracted and photon-subtracted-then-added thermal and even coherent states are studied. Different criteria are used to witness the nonclassical feature, and it is found that the considered states are highly nonclassical. The non-Gaussian photon-addition-then-subtraction operation is also preferred over the photon-subtraction-then-addition for developing nonclassicality.
INDIAN JOURNAL OF PHYSICS
(2023)
Article
Physics, Multidisciplinary
Hyukjoon Kwon, Rick Mukherjee, M. S. Kim
Summary: An important issue in developing quantum technology is the sensitivity of quantum states to noise. We propose a protocol that uses reverse dynamics to precisely control quantum systems against noise. By constructing the Petz recovery map, we explore the potential of using near-optimal recovery to control noisy quantum dynamics.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Pei-Shun Yan, Lan Zhou, Wei Zhong, Yu-Bo Sheng
Summary: In this paper, a measurement-based entanglement purification protocol (MBEPP) is proposed to extract high-quality entangled coherent states (ECSs) from low-quality copies. The protocol can correct errors caused by photon loss and only requires Bell state measurement, making it convenient to implement.
FRONTIERS OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
Jakob Hinney, Adarsh S. Prasad, Sahand Mahmoodian, Klemens Hammerer, Arno Rauschenbeutel, Philipp Schneeweiss, Juergen Volz, Max Schemmer
Summary: The study explores quadrature squeezing observed in a weak guided light field transmitted through an ensemble of atoms coupled to an optical nanofiber. By measuring the squeezing spectrum, direct access to the phase and amplitude of the energy-time entangled part of the two-photon wave function is obtained. The research provides a diagnostic tool for quantum optics devices by characterizing the entangled two-photon component.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
Vojtech Kala, Radim Filip, Petr Marek
Summary: This article analyzes the behavior of quantum states with cubic nonlinear squeezing under loss and dephasing, and proposes the optimization and adjustment of initial parameters to achieve maximum robustness.
Article
Optics
Simon Braeuer, Petr Marek
Summary: This passage discusses the concepts of squeezing and nonlinear squeezing in quantum optics, as well as how states with nonlinear squeezing can be deterministically prepared using self-Kerr gates and Gaussian processing. These states are crucial resources for realizing high-order quadrature phase gates in advanced quantum information processing.
Article
Quantum Science & Technology
Atirach Ritboon, Lukas Slodicka, Radim Filip
Summary: The article explores the application of sequential
phonon measurements in quantum mechanical sensing, simulations and computing, specifically focusing on the motion of trapped atoms. By sequentially measuring force and heating, better sensitivity can be obtained from motional Fock states and quantum Fisher information can be saturated.
QUANTUM SCIENCE AND TECHNOLOGY
(2022)
Article
Physics, Multidisciplinary
Philipp M. Mutter, Guido Burkard
Summary: Noise has a limiting effect on the performance of quantum computers, and this article proposes a novel method of extracting noise characteristics by measuring the time-dependent transmission probability in a photonic cavity.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Priya Malpani, Kishore Thapliyal, J. Banerji, Anirban Pathak
Summary: This paper analyzes the nonclassical and non-Gaussian features of the photon added displaced Fock state, showing that photon addition and displacement parameter affect the nonclassical and non-Gaussian properties. It also highlights that only highly efficient detectors can detect the negativity of the Wigner function.
ANNALEN DER PHYSIK
(2023)
Article
Optics
K. Berrada, O. Aldaghri, S. Abdel-Khalek
Summary: We investigate the time evolution of nonclassical correlation, entropy squeezing, and quantum phase in a system composed of a Cooper pair box (CPB) and a nanomechanical resonator (NR). By considering a Jaynes-Cummings model with time-varying frequency (TVF) and the presence of energy dissipation, we examine the dynamics of quantumness measures and propose a method to avoid energy dissipation effect by choosing proper system parameters. Furthermore, we study quantum entanglement in a two-CPB system.
APPLIED PHYSICS B-LASERS AND OPTICS
(2023)
Article
Physics, Multidisciplinary
Yotam Shapira, Sapir Cohen, Nitzan Akerman, Ady Stern, Roee Ozeri
Summary: In this study, we enhance the fidelity and robustness of entangling gates in quantum computers by introducing spin-dependent squeezing.
PHYSICAL REVIEW LETTERS
(2023)
