Characterization of squeezed states with controllable coherent light injection at sidebands

Li, Wei; Jin, Yuanbin; Yu, Xudong

doi:10.1007/s11433-017-9021-7

Sci. China Phys. Mech. Astron.

2017

DOI: 10.1007/s11433-017-9021-7

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Characterization of squeezed states with controllable coherent light injection at sidebands

Wei Li

Yuanbin Jin

Xudong Yu

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Cited by 3 publications

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“…The theoretical scheme based on BLO to detect the squeezed state was proposed [29] and the phase-sensitive detection with a BLO or a double-sideband signal field were studied experimentally [30][31][32]. And the measurement of a broad squeezed vacuum state by means of a BLO was demonstrated experimentally [33,34]. Recently, by making use of the multi-frequency homodyne detection, the experiments of cross-frequency entanglements generated in periodically pumped OPOs have been reported [35,36].…”

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Enhanced detection of a low-frequency signal by using broad squeezed light and a bichromatic local oscillator

Jin

et al. 2017

Phys. Rev. A

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We experimentally study a protocol of using the broadband high-frequency squeezed vacuum to detect the low-frequency signal. In this scheme, the lower sideband field of the squeezed light carries the low-frequency modulation signal and the two strong coherent light fields are applied as the bichromatic local oscillator in the homodyne detection to measure the quantum entanglement of the upper and lower sideband for the broadband squeezed light. The power of one of local oscillators for detecting the upper sideband can be adjusted to optimize the conditional variance in the low frequency regime by subtracting the photocurrent of the upper sideband field of the squeezed light from that of the lower sideband field. By means of the quantum correlation of the upper and lower sideband for the broadband squeezed light, the low-frequency signal beyond the standard quantum limit is measured. This scheme is appropriate for enhancing sensitivity of low-frequency signal by the aid of the broad squeezed light, such as gravitational waves detection, and does not need to directly produce the low frequency squeezing in optical parametric process.

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confidence: 99%

Enhanced detection of a low-frequency signal by using broad squeezed light and a bichromatic local oscillator

Jin

et al. 2017

Phys. Rev. A

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Optically levitated nanosphere with high trapping frequency

Jin

Zhang

2018

Sci. China Phys. Mech. Astron.

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Experimental quantum Hamiltonian identification from measurement time traces

Hou

Long

2017

Science Bulletin

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Identifying Hamiltonian of a quantum system is of vital importance for quantum information processing. In this Letter, we realized and benchmarked a quantum Hamiltonian identification algorithm recently proposed [Phys. Rev. Lett. 113, 080401 (2014)]. we realized the algorithm on liquid nuclear magnetic resonance quantum information processor using two different working media with different forms of Hamiltonian. Our experiment realized the quantum identification algorithm based on free induction decay signals. We also showed how to process data obtained in practical experiment. We studied the influence of decoherence by numerical simulations. Our experiments and simulations demonstrate that the algorithm is effective and robust. Introduction.-One critical task is to characterize a quantum system so that it can be used for quantum information processing tasks, such as quantum teleportation [1], quantum cryptography [2,3], quantum computation [4,5] and quantum metrology [6]. One way of fully characterizing a quantum system is doing quantum processing tomography (QPT). The QPT approach requires an exponential number of experiments, which makes it difficult to be realized for even a small sized quantum system [7][8][9][10].

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Characterization of squeezed states with controllable coherent light injection at sidebands

Cited by 3 publications

References 19 publications

Enhanced detection of a low-frequency signal by using broad squeezed light and a bichromatic local oscillator

Enhanced detection of a low-frequency signal by using broad squeezed light and a bichromatic local oscillator

Optically levitated nanosphere with high trapping frequency

Experimental quantum Hamiltonian identification from measurement time traces

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