Wigner function tomography via optical parametric amplification

Kalash M, Chekhova MV (2023)

Publication Type: Journal article

Publication year: 2023

Journal

Optica Optical Society of America

Book Volume: 10

Pages Range: 1142-1146

Journal Issue: 9

DOI: 10.1364/OPTICA.488697

Abstract

Wigner function tomography is indispensable for characterizing quantum states, but its commonly used version, balanced homodyne detection, suffers from several weaknesses. First, it requires efficient detection, which is critical for measuring fragile non-Gaussian states, especially bright ones. Second, it needs a local oscillator, tailored to match the spatiotemporal properties of the state under test, and fails for multimode and broadband states. Here we propose Wigner function tomography based on optical parametric amplification followed by direct detection. The method is immune to detection inefficiency and loss, and suitable for broadband, spatially and temporally multimode quantum states. To prove the principle, we experimentally reconstruct the Wigner function of squeezed vacuum occupying a single mode of a strongly multimode state. We obtain a squeezing of −7.5 ± 0.4 dB and purity of 0.91+−0.090.08 despite more than 97% loss caused mainly by filtering. Theoretically, we also consider the reconstruction of a squeezed single photon—a bright non-Gaussian state. Due to multimode parametric amplification, the method allows for simultaneous tomography of multiple modes. This makes it a powerful tool for optical quantum information processing.

Authors with CRIS profile

Maria Chekhova

Additional Organisation(s)

FAU Profilzentrum Licht.Materie.Quantentechnologien (FAU LMQ)

Involved external institutions

Max-Planck-Institut für die Physik des Lichts (MPL) / Max Planck Institute for the Science of Light DE Germany (DE)

How to cite

APA:

Kalash, M., & Chekhova, M.V. (2023). Wigner function tomography via optical parametric amplification. Optica, 10(9), 1142-1146. https://doi.org/10.1364/OPTICA.488697

MLA:

Kalash, Mahmoud, and Maria V. Chekhova. "Wigner function tomography via optical parametric amplification." Optica 10.9 (2023): 1142-1146.

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