Abstract
Collective atomic excitation can be realized by the Raman scattering. Such a photon-atom interface can form an SU(1,1)-typed atom-light hybrid interferometer, where the atomic Raman amplification processes take the place of the beam splitting elements in a traditional Mach-Zehnder interferometer. We numerically calculate the phase sensitivities and the signal-to-noise ratios (SNRs) of this interferometer with the method of homodyne detection and intensity detection, and give their differences of the optimal phase points to realize the best phase sensitivities and the maximal SNRs from these two detection methods. The difference of the effects of loss of light field and atomic decoherence on measure precision is analyzed.
Highlights
Quantum parameter estimation is the use of quantum techniques to improve measurement precision than purely classical approaches, which has been received a lot of attention in recent years [1,2,3,4,5,6,7,8,9,10,11]
Due to overcoming the standard quantum limit (SQL) and reaching the Heisenberg limit (HL) δφ = 1/N, it will lead to potential applications in high resolution measurements
We gave out the phase sensitivities and the SNRs of the atom-light hybrid interferometer with the method of homodyne detection and intensity detection
Summary
Quantum parameter estimation is the use of quantum techniques to improve measurement precision than purely classical approaches, which has been received a lot of attention in recent years [1,2,3,4,5,6,7,8,9,10,11]. By injecting a seeded light field which is correlated with the initially prepared collective atomic excitation, the Raman scattering can be enhanced greatly, which was realized in experiment recently [48]. Such a photon-atom interface can form an SU(1,1)-typed atom-light hybrid interferometer [49], where the atomic Raman amplification processes replacing the beam splitting elements in a traditional MZI [28]. The loss of light field and atomic decoherence will degrade the measure precision, which is explained from the intermode decorrelation conditions break.
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