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Journal of Physics Conference Series

Monitoring of quantum mode correlation functions in the presence of pointer state phase relaxation

Ekaterina S. Trifanova, Alexander Trifanov

Published Aug 1, 2016• 1 citation
Publisher

Abstract

In present work we investigate the process of interaction between two-level atom- pointer and cavity mode to obtain correlation functions of mode quantum state. In particular, we analyze the protocol of indirect photodetection which allow estimations for average values of photon number operator in any order using statistics of atom state detector clicks.

DOI
10.1088/1742-6596/735/1/012044

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In present work we investigate the process of interaction between two-level atom- pointer and cavity mode to obtain correlation functions of mode quantum state. In particular, we analyze the protocol of indirect photodetection which allow estimations for average values of photon number operator in any order using statistics of atom state detector clicks.
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Abstract. An indirect quantum state measurement process is under investigation. Common evolution of detector’s microscopic part (pointer) and measured system (target) is considered to be nonunitary due to the interaction between pointer and environment. System of differential equations for superoperators (operations), which map initial target state to it’s conditional final state is obtained. Developed formalism is applied to the problem of cavity quantum mode photodetection to investigate basic information characteristics of this measurement process. ar X iv
An indirect quantum state measurement process is under investigation. Common evolution of detector's microscopic part (pointer) and measured system (target) is considered to be nonunitary due to the interaction between pointer and environment. System of differential equations for superoperators, which map initial target state to it's conditional final state is obtained. Developed formalism is applied to the problem of cavity quantum mode photodetection to investigate basic information characteristics of this measurement process.
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Direct estimation of g(2)(0)g^{(2)}(0)g(2)(0) from click statistics of a multiplexed detector
We present and theoretically analyze a method for direct estimation of the second-order correlation function g(2)(0)g^{(2)}(0)g(2)(0) from the click statistics of a multiplexed detector composed of M binary on-off detection channels. The method uses linear estimators of the first and second moments of the photon-number operator and can provide accurate results even for optical fields with substantial mean photon numbers. For a fixed number of channels, the detection range can be extended by introducing additional losses before the detector. We demonstrate the performance of the method for coherent, thermal, amplitude-squeezed, and photon-added coherent states. We also derive a nonclassicality criterion based on the estimated correlation function and show how the method can be adapted to unbalanced detectors. Our work establishes direct estimation of g(2)(0)g^{(2)}(0)g(2)(0) as a simple and versatile method for quantitatively characterizing quantum light using multiplexed click detectors.