Mach–Zehnder interferometer with squeezed and EPR entangled optical fields

于旭东,; 李卫,; 朱诗尧,; Zhang, Jing

doi:10.1088/1674-1056/25/2/020304

Cited by 6 publications

(4 citation statements)

References 26 publications

(25 reference statements)

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“…The measurement of quantum noise is a vital step of many quantum optical experiments, such as squeezed state detection [1], coherent state detection [2], and quantum storage [3]. Balanced homodyne detection is a general method to measure quantum noise [4].…”

Section: Introductionmentioning

confidence: 99%

Low Noise Balanced Homodyne Detector for Quantum Noise Measurement

Lang

Zhang

et al. 2022

IEEE Access

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The research of quantum noise in the interaction of laser and atoms plays a critical role in quantum optical experiments. The measurement of quantum noise is mainly based on the balanced homodyne detection method. Here, we reported a balanced homodyne detector with low noise, high gain, and high common-mode rejection ratio (CMRR) at the wavelength of 795 nm. By optimizing the selection of components and PCB layout, a minimum electronic noise of −96.7 dBm is obtained. Over the range of 1 MHz to 5 MHz, we get a flat CMRR above 59 dB and a linear gain regime, which can enable a shot noise measurement with the laser power of 100 μw. The developed detector can be used in quantum coherent experiments with a weak probe laser of power down to tens of microwatts.

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Section: Introductionmentioning

confidence: 99%

Low Noise Balanced Homodyne Detector for Quantum Noise Measurement

Lang

Zhang

et al. 2022

IEEE Access

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“…Squeezed states are usually divided into two types: one is the bright squeezed state that has a coherent amplitude, and the other is the squeezed vacuum state that has no coherent amplitude. [1][2][3][4][5] Which type of squeezed light is desirable is dependent on the applications. In interferometer, the squeezed vacuum state is usually used to reduce the cross-interference influence due to no coherent amplitude.…”

Section: Introductionmentioning

confidence: 99%

A low-noise, high-SNR balanced homodyne detector for the bright squeezed state measurement in 1–100 kHz range*

Wang

Liang

et al. 2020

Chinese Phys. B

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We report a low-noise, high-signal-to-noise-ratio (SNR) balanced homodyne detector based on the standard transimpedance amplifier circuit and the inductance and capacitance combination for the measurement of the bright squeezed state in the range from 1 kHz to 100 kHz. A capacitance is mounted at the input end of the AC branch to prevent the DC photocurrent from entering the AC branch and avoid AC branch saturation. By adding a switch at the DC branch, the DC branch can be flexibly turned on and off on different occasions. When the switch is on, the DC output provides a monitor signal for laser beam alignment. When the switch is off, the electronic noise of the AC branch is greatly reduced at audio-frequency band due to immunity to the impedance of the DC branch, hence the SNR of the AC branch is significantly improved. As a result, the electronic noise of the AC branch is close to −125 dBm, and the maximum SNR of the AC branch is 48 dB with the incident power of 8 mW in the range from 1 kHz to 100 kHz. The developed photodetector paves a path for measuring the bright squeezed state at audio-frequency band.

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“…[8] Squeezed vacuum state, which is the brightest experimentally availble nonclassical light, has also received much attention. [9][10][11][12][13][14][15][16] In particular, it is found that an MZI with a two-mode squeezed vacuum state (TMSVS) and parity detection can offer sub-Heisenberg sensitivity. [10] In recent years, it is of particular interest to investigate the enhancement given by non-Gaussian states or operations for quantum communication, metrology, imaging, and information processing.…”

Section: Introductionmentioning

confidence: 99%

Quantum optical interferometry via general photon-subtracted two-mode squeezed states*

et al. 2019

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We investigate the sensitivity of phase estimation in a Mach–Zehnder interferometer with photon-subtracted two-mode squeezed vacuum states. Our results show that, for given initial squeezing parameter, both symmetric and asymmetric photon subtractions can further improve the quantum Cramér–Rao bound (i.e., the ultimate phase sensitivity), especially for single-mode photon subtraction. On the other hand, the quantum Cramér–Rao bound can be reached by parity detection for symmetric photon-subtracted two-mode squeezed vacuum states at particular values of the phase shift, but it is not valid for asymmetric photon-subtracted two-mode squeezed vacuum states. In addition, compared with the two-mode squeezed vacuum state, the phase sensitivity via parity detection with asymmetric photon-subtracted two-mode squeezed vacuum states will be getting worse. Thus, parity detection may not always be the optimal detection scheme for nonclassical states of light when they are considered as the interferometer states.

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Mach–Zehnder interferometer with squeezed and EPR entangled optical fields

Cited by 6 publications

References 26 publications

Low Noise Balanced Homodyne Detector for Quantum Noise Measurement

Low Noise Balanced Homodyne Detector for Quantum Noise Measurement

A low-noise, high-SNR balanced homodyne detector for the bright squeezed state measurement in 1–100 kHz range*

Quantum optical interferometry via general photon-subtracted two-mode squeezed states*

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