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Li B, Qin W, Jiao YF, Zhai CL, Xu XW, Kuang LM, Jing H. Optomechanical Schrödinger cat states in a cavity Bose-Einstein condensate. FUNDAMENTAL RESEARCH 2022. [DOI: 10.1016/j.fmre.2022.07.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Tan QS, Yuan JB, Liao JQ, Kuang LM. Supersensitive estimation of the coupling rate in cavity optomechanics with an impurity-doped Bose-Einstein condensate. OPTICS EXPRESS 2020; 28:22867-22881. [PMID: 32752540 DOI: 10.1364/oe.392902] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Accepted: 07/07/2020] [Indexed: 06/11/2023]
Abstract
We propose a scheme to implement a supersensitive estimation of the coupling strength in a hybrid optomechanical system which consists of a cavity-Bose-Einstein condensate system coupled to an impurity. This method can dramatically improve the estimation precision even when the involved photon number is small. The quantum Fisher information indicates that the Heisenberg scale sensitivity of the coupling rate could be obtained when the photon loss rate is smaller than the corresponding critical value in the input of either coherent state or squeezed state. The critical photon decay rate for the coherent state is larger than that of the squeezed state, and the coherent state input case is more robust against the photon loss than the squeezed state case. We also present the measurement scheme which can saturate the quantum Cramér-Rao bound.
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Chen TY, Zhang WZ, Fang RZ, Hang CZ, Zhou L. Multi-path photon-phonon converter in optomechanical system at single-quantum level. OPTICS EXPRESS 2017; 25:10779-10790. [PMID: 28788767 DOI: 10.1364/oe.25.010779] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Based on photon-phonon nonlinear interaction, a scheme of controllable photon-phonon converters is proposed at single-quantum level in a composed quadratically coupled optomechanical system. With the assistance of the mechanical oscillator, the Kerr nonlinear effect between photon and phonon is enhanced so that the single-photon state can be converted into the phonon state with high fidelity even under the current experimental condition that the single-photon coupling rate is much smaller than mechanical frequency (g ≪ ωm). The state transfer protocols and their transfer fidelity are discussed analytically and numerically. A multi-path photon-phonon converter is designed by combining the optomechanical system with low frequency resonators, which can be controlled by experimentally adjustable parameters. This work provides us a potential platform for quantum state transfer and quantum information.
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Hoang TM, Ma Y, Ahn J, Bang J, Robicheaux F, Yin ZQ, Li T. Torsional Optomechanics of a Levitated Nonspherical Nanoparticle. PHYSICAL REVIEW LETTERS 2016; 117:123604. [PMID: 27689273 DOI: 10.1103/physrevlett.117.123604] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Indexed: 06/06/2023]
Abstract
An optically levitated nanoparticle in vacuum is a paradigm optomechanical system for sensing and studying macroscopic quantum mechanics. While its center-of-mass motion has been investigated intensively, its torsional vibration has only been studied theoretically in limited cases. Here we report the first experimental observation of the torsional vibration of an optically levitated nonspherical nanoparticle in vacuum. We achieve this by utilizing the coupling between the spin angular momentum of photons and the torsional vibration of a nonspherical nanoparticle whose polarizability is a tensor. The torsional vibration frequency can be 1 order of magnitude higher than its center-of-mass motion frequency, which is promising for ground state cooling. We propose a simple yet novel scheme to achieve ground state cooling of its torsional vibration with a linearly polarized Gaussian cavity mode. A levitated nonspherical nanoparticle in vacuum will also be an ultrasensitive nanoscale torsion balance with a torque detection sensitivity on the order of 10^{-29} N m/sqrt[Hz] under realistic conditions.
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Affiliation(s)
- Thai M Hoang
- Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907, USA
| | - Yue Ma
- Center for Quantum Information, Institute of Interdisciplinary Information Sciences, Tsinghua University, Beijing 100084, China
- Department of Physics, Tsinghua University, Beijing 100084, China
| | - Jonghoon Ahn
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907, USA
| | - Jaehoon Bang
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907, USA
| | - F Robicheaux
- Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907, USA
- Purdue Quantum Center, Purdue University, West Lafayette, Indiana 47907, USA
| | - Zhang-Qi Yin
- Center for Quantum Information, Institute of Interdisciplinary Information Sciences, Tsinghua University, Beijing 100084, China
| | - Tongcang Li
- Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907, USA
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907, USA
- Purdue Quantum Center, Purdue University, West Lafayette, Indiana 47907, USA
- Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA
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Zhang K, Meystre P, Zhang W. Role reversal in a Bose-condensed optomechanical system. PHYSICAL REVIEW LETTERS 2012; 108:240405. [PMID: 23004243 DOI: 10.1103/physrevlett.108.240405] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2012] [Indexed: 06/01/2023]
Abstract
We analyze the optomechanicslike properties of a Bose-Einstein condensate (BEC) trapped inside an optical resonator and driven by both a classical and a quantized light field. We find that this system exhibits the nature of role reversal between the matter-wave field and the quantized light field. As a result, the matter-wave field now plays the role of the quantized light field, and the quantized light field behaves like a movable mirror, in contrast to the familiar situation in BEC-based cavity optomechanics [Brennecke et al., Science 322, 235 (2008); Murch et al., Nature Phys. 4, 561 (2008)]. We demonstrate that this system can lead to the creation of a variety of nonclassical matter-wave fields, in particular, cat states, and discuss several possible protocols to measure their Wigner function.
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Affiliation(s)
- Keye Zhang
- Quantum Institute for Light and Atoms, Department of Physics, East China Normal University, Shanghai, People's Republic of China.
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