Effects of losses in the atom-light hybrid SU(1,1) interferometer

Chen, Zhao-Dan; Yuan, Chun-Hua; Ma, Hongmei; Li, Dong; Chen, L. Q.; Ou, Z. Y.; Zhang, Weiping

doi:10.1364/oe.24.017766

Cited by 31 publications

(25 citation statements)

References 62 publications

(74 reference statements)

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“…This generates a high degree of particle entanglement within the interferometer, allowing phase measurements at the ultimate Heisenberg limit while additionally providing a robustness to inefficient particle detection [8,9]. This excellent "per particle" sensitivity and robustness has resulted in a strong theoretical interest in SU (1,1) interferometry [10][11][12][13], and its experimental realization in optical systems [14,15], hybrid atom-light interferometers [16], and spinor Bose-Einstein condensates (BECs) [17][18][19].…”

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confidence: 99%

Pumped-Up SU(1,1) Interferometry

2017

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Although SU(1,1) interferometry achieves Heisenberg-limited sensitivities, it suffers from one major drawback: Only those particles outcoupled from the pump mode contribute to the phase measurement. Since the number of particles outcoupled to these "side modes" is typically small, this limits the interferometer's absolute sensitivity. We propose an alternative "pumped-up" approach where all the input particles participate in the phase measurement and show how this can be implemented in spinor BoseEinstein condensates and hybrid atom-light systems-both of which have experimentally realized SU(1,1) interferometry. We demonstrate that pumped-up schemes are capable of surpassing the shot-noise limit with respect to the total number of input particles and are never worse than conventional SU (1,1) interferometry. Finally, we show that pumped-up schemes continue to excel-both absolutely and in comparison to conventional SU(1,1) interferometry-in the presence of particle losses, poor particleresolution detection, and noise on the relative phase difference between the two side modes. Pumped-up SU(1,1) interferometry therefore pushes the advantages of conventional SU(1,1) interferometry into the regime of high absolute sensitivity, which is a necessary condition for useful quantum-enhanced devices.

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confidence: 99%

Pumped-Up SU(1,1) Interferometry

2017

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“…The SNR is also an important parameter to characterize the performance of an interferometer and can be calculated by SNR= [44,45], where Ô is the measurable operator, 𝛿 is the added modulation small phase and (Δ Ô) 2 = Ô2 − Ô 2 . Under ID, the SNR SU for the output optical field is…”

Section: Optimization Conditionmentioning

confidence: 99%

Sensing performance enhancement via asymmetric gain optimization in the atom-light hybrid interferometer

Yu,

Fang,

Chen

et al. 2022

Preprint

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The SU (1,1)-type atom-light hybrid interferometer (SALHI) is a kind of interferometer that is sensitive to both the optical phase and atomic phase. However, the loss has been an unavoidable problem in practical applications and greatly limits the use of interferometers. Visibility is an important parameter to evaluate the performance of interferometers. Here, we experimentally demonstrate the mitigating effect of the loss on visibility of the SALHI via asymmetric gain optimization, where the maximum threshold of loss to visibility close to 100% is increased. Furthermore, we theoretically find that the optimal condition for the largest visibility is the same as that for the enhancement of signal-to-noise ratio (SNR) to the best value with the existence of the losses using the intensity detection, indicating that visibility can act as an experimental operational criterion for SNR improvement in practical applications. Improvement of the interference visibility means achievement of SNR enhancement. Our results provide a significant foundation for practical application of the SALHI in radar and ranging measurements.

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“…1(a). There are two types of atom-light interferometers [28,29,32,33]. The first type is an analog of Mach-Zehnder/Michaelson optical interferometer but with atom-light mixer replacing regular beam splitters for linear superposition of atomic waves and optical waves [27,29].…”

Section: Qnd Measurement Of Photon Number By Atom-light Interferometersmentioning

confidence: 99%

Quantum non-demolition measurement of photon number with atom-light interferometers

Chen

et al. 2017

Opt. Express

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When atoms are illuminated by an off-resonant field, the AC Stark effect will lead to phase shifts in atomic states. The phase shifts are proportional to the photon number of the off-resonant illuminating field. By measuring the atomic phase with newly developed atom-light hybrid interferometers, we can achieve quantum non-demolition measurement of the photon number of the optical field. In this paper, we analyze theoretically the performance of this QND measurement scheme by using the QND measurement criteria established by Holland et al [Phys. Rev. A 42, 2995 (1990)]. We find the quality of the QND measurement depends on the phase resolution of the atom-light hybrid interferometers. We apply this QND measurement scheme to a twin-photon state from parametric amplifier to verify the photon correlation in the twin beams. Furthermore, a sequential QND measurement procedure is analyzed for verifying the projection property of quantum measurement and for the quantum information tapping. Finally, we discuss the possibility for single-photon-number-resolving detection via QND measurement.

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Effects of losses in the atom-light hybrid SU(1,1) interferometer

Cited by 31 publications

References 62 publications

Pumped-Up SU(1,1) Interferometry

Pumped-Up SU(1,1) Interferometry

Sensing performance enhancement via asymmetric gain optimization in the atom-light hybrid interferometer

Quantum non-demolition measurement of photon number with atom-light interferometers

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