Experimental measurement of covariance matrix of two-mode entangled state

Yu, Xudong; Li, Wei; Jin, Yuanbin; Zhang, Jing

doi:10.1007/s11433-014-5448-7

Cited by 3 publications

(3 citation statements)

References 25 publications

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“…Two degenerate optical parametric amplifiers (OPA's) are pumped by a green laser 532 nm and are feeded by the infrared laser 1064 nm. [22,23] The light is a diode-pumped intracavity frequency-doubled (continuous-wave ring Nd:YVO 4 + KTP) laser. The periodically poled KTP (PPKTP) crystals are used in the OPA's, whose temperatures are controlled by the temperature controllers.…”

Section: Experiments and Resultsmentioning

confidence: 99%

Mach–Zehnder interferometer with squeezed and EPR entangled optical fields

于旭东¹,

李卫²,

朱诗尧³

et al. 2016

Chinese Phys. B

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We study a scheme for Mach–Zehnder (MZ) interferometer as a quantum linear device by injecting two-mode squeezed input states into two ports of interferometer. Two-mode squeezed states can be changed into two types of inputs for MZ interferometer: two squeezed states and Einstein–Podolsky–Rosen (EPR) entangled states. The interference patterns of the MZ interferometer vary periodically as the relative phase of the two arms of the interferometer is scanned, and are measured by the balanced homodyne detection system. Our experiments show that there are different interference patterns and periodicity of the output quantum states for two cases which depend on the relative phase of input optical fields. Since MZ interferometer can be used to realize some quantum operations, this work will have the important applications in quantum information and metrology.

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Section: Experiments and Resultsmentioning

confidence: 99%

Mach–Zehnder interferometer with squeezed and EPR entangled optical fields

于旭东¹,

李卫²,

朱诗尧³

et al. 2016

Chinese Phys. B

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“…Although the frequencies of two sidebands are different with that of LO, it still refers as balanced homodyne detection since two sidebands locate symmetrically at the two sides of the carrier frequency of LO, and at the same time the relative phase of two sidebands is fixed. This balanced homodyne detection for two sidebands has been exploited widely in quantum optics experiments [6][7][8]19,20]. We will demonstrate that this balanced homodyne detection is also phase-sensitive and its signal-tonoise ratio is two-fold better than that with heterodyne detection.…”

Section: Introductionmentioning

confidence: 82%

“…It is well known that balanced detection can cancel the noise resulting from local oscillator [4,5]. Balanced homodyne detection is *Corresponding author (email: jzhang74@sxu.edu.cn) †Contributed by ZHANG Jing (Associated Editor) phase sensitive and has been intensively utilized to measure non-classical states of light [6][7][8][9][10] and further in quantum information experiments [11][12][13][14]. Heterodyne detection has been shown that its signal-to-noise ratio is two-fold worse than that with homodyne detection [4,5,15,16].…”

Section: Introductionmentioning

confidence: 99%

Experimental study of balanced optical homodyne and heterodyne detection by controlling sideband modulation

Meng

et al. 2015

Sci. China Phys. Mech. Astron.

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We experimentally study optical homodyne and heterodyne detections with the same setup, which is flexible to manipulate the signal sideband modulation. When the modulation only generates a single signal sideband, the light field measurement by mixing the single sideband at ω 0 ± Ω with a strong local oscillator at the carrier frequency ω 0 on a beam splitter becomes balanced heterodyne detection. When two signal sidebands at ω 0 ± Ω are generated and the relative phase of the two sidebands is locked, this measurement corresponds to optical balanced homodyne detection. With this setup, we may confirm directly that the signal-to-noise ratio with heterodyne detection is two-fold worse than that with homodyne detection. This work will have important applications in quantum state measurement and quantum information. homodyne detection, heterodyne detection, sideband modulation, the signal-to-noise ratio PACS number(s): 01.50.Pa, 03.65.Ta, 42.50.Lc Citation: Li W, Yu X D, Meng Z M, et al. Experimental study of balanced optical homodyne and heterodyne detection by controlling sideband modulation. Sci

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Characterization of squeezed states with controllable coherent light injection at sidebands

Jin

2017

Sci. China Phys. Mech. Astron.

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Experimental measurement of covariance matrix of two-mode entangled state

Cited by 3 publications

References 25 publications

Mach–Zehnder interferometer with squeezed and EPR entangled optical fields

Mach–Zehnder interferometer with squeezed and EPR entangled optical fields

Experimental study of balanced optical homodyne and heterodyne detection by controlling sideband modulation

Characterization of squeezed states with controllable coherent light injection at sidebands

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