Quantum tomography enhanced through parametric amplification

Knyazev E, Spasibko KY, Chekhova MV, Khalili FY (2018)

Publication Type: Journal article

Publication year: 2018

Journal

New Journal of Physics Institute of Physics: Open Access Journals / Institute of Physics (IoP) and Deutsche Physikalische Gesellschaft

Book Volume: 20

Article Number: 013005

Journal Issue: 1

DOI: 10.1088/1367-2630/aa99b4

Abstract

Quantum tomography is the standard method of reconstructing the Wigner function of quantum states of light by means of balanced homodyne detection. The reconstruction quality strongly depends on the photodetectors quantum efficiency and other losses in the measurement setup. In this article we analyze in detail a protocol of enhanced quantum tomography, proposed by Leonhardt and Paul [1] which allows one to reduce the degrading effect of detection losses. It is based on phase-sensitive parametric amplification, with the phase of the amplified quadrature being scanned synchronously with the local oscillator phase. Although with sufficiently strong amplification the protocol enables overcoming any detection inefficiency, it was so far not implemented in the experiment, probably due to the losses in the amplifier. Here we discuss a possible proof-of-principle experiment with a traveling-wave parametric amplifier. We show that with the state-of-the-art optical elements, the protocol enables high fidelity tomographic reconstruction of bright non-classical states of light. We consider two examples: bright squeezed vacuum and squeezed single-photon state, with the latter being a non-Gaussian state and both strongly affected by the losses.

Authors with CRIS profile

Maria Chekhova

Involved external institutions

Lomonosov Moscow State University / Московский государственный университет имени М.В.Ломоносова RU Russian Federation (RU) Max-Planck-Institut für die Physik des Lichts (MPL) / Max Planck Institute for the Science of Light DE Germany (DE) Russian Quantum Center RU Russian Federation (RU)

How to cite

APA:

Knyazev, E., Spasibko, K.Y., Chekhova, M.V., & Khalili, F.Y. (2018). Quantum tomography enhanced through parametric amplification. New Journal of Physics, 20(1). https://doi.org/10.1088/1367-2630/aa99b4

MLA:

Knyazev, Eugene, et al. "Quantum tomography enhanced through parametric amplification." New Journal of Physics 20.1 (2018).

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