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Russian Microelectronics

Tomography of Optical Quantum States with Imperfect Photon-Number-Resolving Detectors

I. A. Dmitriev, I. K. Golyshev, N. A. Bogdanova, Yu. I. Bogdanov, V. F. Lukichev

Published Dec 1, 2025• 0 citations
Publisher

Abstract

Abstract A method for quantum state estimation using nonideal photon detection devices has been developed. Using the example of squeezed coherent states, we study the influence of detector efficiency and “dead time” on the fidelity of quantum-state reconstruction for photon-number-resolving (PNR) detectors.
DOI
10.1134/s106373972560164x

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The photon number distribution is reconstructed from the measured statistics of vacuum states in single-photon detection. Numerical results are presented for the coherent, thermal, number and squeezed-vacuum states. The quantum efficiency of single-photon detection should be high for the successful evaluation of the number state. The quantum efficiency provides the marginal influence for the evaluation of the coherent, thermal and squeezed-vacuum states. However, the accuracy of the reconstructed photon number distribution of the squeezed-vacuum state is low even though the quantum efficiency is unity. For a more accurate reconstruction, we must obtain a priori information on the photon number distribution of the squeezed-vacuum state.
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