Robust phase metrology with hybrid quantum interferometers against
particle losses
- URL: http://arxiv.org/abs/2303.06604v1
- Date: Sun, 12 Mar 2023 08:14:01 GMT
- Title: Robust phase metrology with hybrid quantum interferometers against
particle losses
- Authors: X. N. Feng, D. He, L. F. Wei
- Abstract summary: Entanglement is an important quantum resource to achieve high sensitive quantum metrology.
We propose a spin-oscillator hybrid quantum interferometer to achieve the desirable precise estimation of the encoded parameter.
The proposed hybrid quantum interferometer possesses a manifest robustness against the particle losses of the vibrational modes.
- Score: 0.0
- License: http://creativecommons.org/publicdomain/zero/1.0/
- Abstract: Entanglement is an important quantum resource to achieve high sensitive
quantum metrology. However, the rapid decoherence of quantum entangled states,
due to the unavoidable environment noise, result in practically the unwanted
sharp drop of the measurement sensitivity. To overcome such a difficulty, here
we propose a spin-oscillator hybrid quantum interferometer to achieve the
desirable precise estimation of the parameter encoded in the vibrations of the
oscillator. Differing from the conventional two-mode quantum interferometers
input by the two-mode NOON state or entangled coherent states (ECS), whose
achievable sensitivities are strongly limited by the decoherence of the
entangled vibrational states, we demonstrate that the present interferometer,
input by a spin-dependent two-mode entangled state, possesses a manifest
advantage, i.e., the measurement sensitivity of the estimated parameter is not
influenced by the decoherence from the spin-oscillator entanglement. This is
because that, by applying a spin-oscillator disentangled operation, the
information of the estimated parameter encoded originally in the vibrational
degrees can be effectively transferred into the spin degree and then can be
sensitively estimated by the precise spin-state population measurements. As
consequence, the proposed hybrid quantum interferometer possesses a manifest
robustness against the particle losses of the vibrational modes. Interestingly,
the achieved phase measurement sensitivity can still surpass the SQL obviously,
even if relatively large number of particle loss occurs in one of the two
modes. The potential application of the proposed spin-oscillator hybrid quantum
interferometer is also discussed.
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