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Trapped Ion Quantum Computing

Quantum interferometry via a coherent state mixed with a photon-added squeezed vacuum state

arXiv
Authors: Shui Wang, Xuexiang Xu, Yejun Xu, Lijian Zhang

Year

2018

Paper ID

24351

Status

Preprint

Abstract Read

~2 min

Abstract Words

101

Citations

N/A

Abstract

We theoretically investigate the phase sensitivity with parity detection on a Mach-Zehnder interferometer with a coherent state combined with a photon-added squeezed vacuum state. When the phase shift approaches zero, the squeezed vacuum state is indeed the optimal state within a constraint on the average number of photons. However, when the phase shift to be estimated slightly deviates from zero, the optimal state is neither the squeezed vacuum state nor the photon-subtracted squeezed vacuum state, but the photon-added squeezed vacuum state when they carry many photons. Finally, we show that the quantum Cramér-Rao bound can be reached by parity detection.

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  • We theoretically investigate the phase sensitivity with parity detection on a Mach-Zehnder interferometer with a coherent state combined with a photon-added squeezed vacuum state.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:1810.00131 [2] arXiv https://arxiv.org/abs/1810.00131 [3] Publisher https://arxiv.org/abs/1810.00131

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