Classical Inputs and Measurements Enable Phase Sensitivity beyond the Shot-Noise Limit

Zhang, Jiandong; Zhang, Zijing; Cen, Longzhu; Hu, Junyan; Zhao, Yuan

doi:10.48550/arxiv.2001.00160

Cited by 2 publications

(2 citation statements)

References 19 publications

(24 reference statements)

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“…Trivially, when g = 0, our protocol reduces to a classical interferometer, which is consistent with the result reported in Ref. [22].…”

Section: B Phase Sensitivitysupporting

confidence: 91%

Phase sensitivity approaching quantum Cramer-Rao bound in a modified SU(1,1) interferometer

Zhang,

You,

et al. 2020

Preprint

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SU(1,1) interferometers, based on the usage of nonlinear elements, are superior to passive interferometers in phase sensitivity. However, the SU(1,1) interferometer cannot make full use of photons carrying phase information as the second nonlinear element annihilates some of the photons inside. Here, we focus on improving phase sensitivity and propose a new protocol based on a modified SU(1,1) interferometer, where the second nonlinear element is replaced by a beam splitter. We utilize two coherent states as inputs and implement balanced homodyne measurement at the output. Our analysis suggests that the protocol we propose can achieve sub-shot-noise-limited phase sensitivity and is robust against photon loss and background noise. Our work is important for practical quantum metrology using SU(1,1) interferometers.

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“…Trivially, when g = 0, our protocol reduces to a classical interferometer, which is consistent with the result reported in Ref. [22].…”

Section: B Phase Sensitivitysupporting

confidence: 91%

Phase sensitivity approaching quantum Cramer-Rao bound in a modified SU(1,1) interferometer

Zhang,

You,

et al. 2020

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…The phase sensitivity of an interferometer can be improved by using quantum resources [14]. There are many theoretical proposals and experimental techniques are developed to improve the sensitivity [15][16][17][18][19][20]. By using carefully chosen input states such as the Schröinger's cat state (NOON state), SQL is overcome and the 3 Author to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Improving the phase sensitivity of an SU (1, 1) interferometer via a nonlinear phase encoding

Seth

Xiong

et al. 2020

J. Phys. B: At. Mol. Opt. Phys.

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We propose a scheme that a dynamically evolving atom-molecule condensate maps onto an SU(1, 1) interferometer, which includes a nonlinear medium (nonlinear phase encoding). We give an analytical result of the phase uncertainty from the error propagation by measuring the particle number at the output and demonstrate the optimal quantum metrology, which is obtained with a time-reversal protocol. We show the phase sensitivity of the nonlinear medium with time-reversal protocol scales as 1/(2.1N2), which overcome the conventional sensitivity limit of 1/N. Finally, the effect of the poor particle resolution detection on the phase sensitivity is discussed.

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Classical Inputs and Measurements Enable Phase Sensitivity beyond the Shot-Noise Limit

Cited by 2 publications

References 19 publications

Phase sensitivity approaching quantum Cramer-Rao bound in a modified SU(1,1) interferometer

Phase sensitivity approaching quantum Cramer-Rao bound in a modified SU(1,1) interferometer

Improving the phase sensitivity of an SU (1, 1) interferometer via a nonlinear phase encoding

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