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Broadband multi-channel quantum noise suppression and phase-sensitive modulation based on entangled beam |
| Ke Di(邸克), Shuai Tan(谈帅), Anyu Cheng(程安宇), Yu Liu(刘宇), and Jiajia Du(杜佳佳)† |
| Chongqing University of Post and Telecommunications, Chongqing 400065, China |
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Abstract We present a theoretical scheme for broadband multi-channel quantum noise suppression and phase-sensitive modulation of continuous variables in a coupled resonant system with quantum entanglement properties. The effects of different coupling strengths, pumping power in suppressing quantum noise and controlling the width of quantum interference channels are analyzed carefully. Furthermore, quantum noise suppression at quadrature amplitude is obtained with phase-sensitive modulation. It shows that the entanglement strength of the output field and the quantum noise suppression effect can be enhanced significantly by a strong pumping filed due to interaction of pumping light with the nonlinear crystal. The full width at half maxima (FWHM) of the noise curve at the resonant peak ($\varDelta$ =0 MHz) is broadened up to 2.17 times compared to the single cavity. In the strong coupling resonant system, the FWHM at $\varDelta$ =0 MHz ($\varDelta$ =±3.1 MHz) is also broadened up to 1.27 (3.53) times compared to the weak coupling resonant system case. The multi-channel quantum interference creates an electromagnetically induced transparent-like line shape, which can be used to improve the transmission efficiency and stability of wave packets in quantum information processing and quantum memory.
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Received: 02 February 2023
Revised: 19 May 2023
Accepted manuscript online: 25 May 2023
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PACS:
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03.65.Ud
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(Entanglement and quantum nonlocality)
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42.50.Lc
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(Quantum fluctuations, quantum noise, and quantum jumps)
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42.65.Yj
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(Optical parametric oscillators and amplifiers)
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| Fund: Project supported by National Natural Science Foundation of China (Grant Nos. 11704053 and 52175531) and the Science and Technology Research Program of Chongqing Municipal Education Commission (Grant No. KJQN201800629). |
Corresponding Authors:
Jiajia Du
E-mail: dujj@cqupt.edu.cn
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Cite this article:
Ke Di(邸克), Shuai Tan(谈帅), Anyu Cheng(程安宇), Yu Liu(刘宇), and Jiajia Du(杜佳佳) Broadband multi-channel quantum noise suppression and phase-sensitive modulation based on entangled beam 2023 Chin. Phys. B 32 100302
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