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情報通信研究機構季報

Manipulation and measurement of quantum signals via non-Gaussian operation

Akira Kitagaw, Masahiro Takeoka, Masahide Sasaki, Anthony Chefles, Norbert Lütkenhaus

Published Sep 1, 2006• 0 citations
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Quantum state preparation is an essential ingredient in quantum information processing. In this letter, based on quantum coherent control induced by Bell measurement, non-Gaussian operations, namely adding (subtracting) one single photon to (from) Gaussian-like input signal field, has been implemented to generate a single-photon-added and -subtracted coherent (SPASC) superposition state. In order to carry out the coherent control, a specified conceptual experiment apparatus has been proposed. By adjusting beamsplitter reflectivity and parameter gain of χ(2) nonlinear crystal, the ingredients of this superposition state can be manipulated. With the help of quasi-probability distribution Wigner function, the evolution of non-classical properties with two controllable parameters can be visualized for this superposition state. The results show a quantum non-Gaussian superposition state can be generated by the measurement-induced coherent control scheme.
Quantum illumination is a quantum sensing protocol primarily used for object detection, which aims to detect the presence of a target with low reflectivity in the free space using quantum light fields. Here we investigate a quantum illumination scheme using an entangled light source by performing non-Gaussian operations on the two-mode squeezed vacuum (TMSV) state in order to reduce the detection error probability and meanwhile improve the signal-to-noise (SNR) ratio. We demonstrate that under the same squeezing parameter, the non-Gaussian operations can significantly reduce the detection error rate compared with the original TMSV state. Under the same average signal photon number, both the TMSV states with and without non-Gaussian operations can provide smaller error rate than that of the coherent state. In addition, we consider the balanced homodyne detection on idler and return signal photons as joint measurement and find that non-Gaussian operations can enhance the SNR of target detection by about 6--9 dB compared with that using TMSV. These results here demonstrate the advantage of the non-Gaussian entangled source in quantum illumination protocol and can find potential applications in target detection in noisy environment.