Wigner Function Tomography via Optical Parametric Amplification

• URL: http://arxiv.org/abs/2207.10030v4
• Date: Thu, 6 Jul 2023 06:13:53 GMT
• Title: Wigner Function Tomography via Optical Parametric Amplification
• Authors: Mahmoud Kalash and Maria V. Chekhova
• Abstract summary: Wigner function tomography is indispensable for characterizing quantum states. It requires efficient detection, which is critical for measuring fragile non-Gaussian states, especially bright ones. Here we propose Wigner function tomography based on optical parametric amplification followed by direct detection.
• Score: 3.9494540318680365
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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 $-7.5\pm 0.4$ dB and a purity of $0.91^{+0.09}_{-0.08}$ 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 strong multimode parametric amplification, the method allows for the simultaneous tomography of multiple modes. This makes it a powerful tool for optical quantum information processing.

Related papers

• Photon Generation in Double Superconducting Cavities: Quantum Circuits Implementation [41.94295877935867]
  We studied photon generation due to the Dynamical Casimir Effect (DCE) in a one dimensional (1+1) double superconducting cavity. The total length of the double cavity $L$, the difference in length between the two cavities $Delta L$, and the electric susceptibility $chi$ are tunable parameters.
  arXiv  Detail & Related papers  (2024-07-19T14:33:45Z)
• Neural Network Enhanced Single-Photon Fock State Tomography [6.434126816101052]
  We report the experimental implementation of single-photon quantum state tomography by directly estimating target parameters. Our neural network enhanced quantum state tomography characterizes the photon number distribution for all possible photon number states from the balanced homodyne detectors. Such a fast, robust, and precise quantum state tomography provides us a crucial diagnostic toolbox for the applications with single-photon Fock states and other non-Gaussisan quantum states.
  arXiv  Detail & Related papers  (2024-05-05T04:58:18Z)
• Classification of quantum states of light using random measurements through a multimode fiber [42.5342379899288]
  We present an optical scheme based on sending unknown input states through a multimode fiber. A short multimode fiber implements effectively a random projection in the spatial domain. A long-dispersive multimode fiber performs a spatial and spectral projection.
  arXiv  Detail & Related papers  (2023-10-20T15:48:06Z)
• Two-mode squeezing over deployed fiber coexisting with conventional communications [55.41644538483948]
  Multi-mode squeezing is critical for enabling CV quantum networks and distributed quantum sensing. To date, multi-mode squeezing measured by homodyne detection has been limited to single-room experiments. This demonstration enables future applications in quantum networks and quantum sensing that rely on distributed multi-mode squeezing.
  arXiv  Detail & Related papers  (2023-04-20T02:29:33Z)
• Gaussian Quantum Illumination via Monotone Metrics [6.626330159001871]
  We show that two-mode squeezed vacuum (TMSV) states are the optimal probe among pure Gaussian states with fixed signal mean photon number. Third, we show that it is of utmost importance to prepare an efficient idler memory to beat coherent states and provide analytic bounds on the idler memory transmittivity in terms of signal power, background noise, and idler memory noise.
  arXiv  Detail & Related papers  (2023-02-15T07:13:04Z)
• Experimental realization of deterministic and selective photon addition in a bosonic mode assisted by an ancillary qubit [50.591267188664666]
  Bosonic quantum error correcting codes are primarily designed to protect against single-photon loss. Error correction requires a recovery operation that maps the error states -- which have opposite parity -- back onto the code states. Here, we realize a collection of photon-number-selective, simultaneous photon addition operations on a bosonic mode.
  arXiv  Detail & Related papers  (2022-12-22T23:32:21Z)
• Frequency-Aware Self-Supervised Monocular Depth Estimation [41.97188738587212]
  We present two versatile methods to enhance self-supervised monocular depth estimation models. The high generalizability of our methods is achieved by solving the fundamental and ubiquitous problems in photometric loss function. We are the first to propose blurring images to improve depth estimators with an interpretable analysis.
  arXiv  Detail & Related papers  (2022-10-11T14:30:26Z)
• Waveguided sources of consistent, single-temporal-mode squeezed light: the good, the bad, and the ugly [0.0]
  We study theoretically how the brightness of pumps, with fixed profiles, affects the temporal mode structure of squeezed states generated by fixed parametric waveguided sources. We find that the temporal modes of these squeezed states can be partially mismatched and thus distinguishable, which is undesirable when using these states as resources for quantum computing or heralded state generation.
  arXiv  Detail & Related papers  (2022-09-27T16:14:33Z)
• Distributed quantum sensing with optical lattices [0.0]
  In distributed quantum sensing the correlations between multiple modes, typically of a photonic system, are utilized to enhance the measurement precision of an unknown parameter. We show that it can allow for parameter estimation at the Heisenberg limit of $(N(M-1)T)2$, where $N$ is the number of particles, $M$ is the number of modes, and $T$ is the measurement time.
  arXiv  Detail & Related papers  (2022-08-10T03:47:44Z)
• Beating the thermal limit of qubit initialization with a Bayesian Maxwell's demon [48.7576911714538]
  Fault-tolerant quantum computing requires initializing the quantum register in a well-defined fiducial state. In solid-state systems, this is typically achieved through thermalization to a cold reservoir. We present a method of preparing a fiducial quantum state with a confidence beyond the thermal limit.
  arXiv  Detail & Related papers  (2021-10-05T13:55:08Z)
• Neural networks for detecting multimode Wigner-negativity [0.0]
  We introduce a new technique, based on a machine learning protocol with artificial Neural Networks, that allows to directly detect negativity of the Wigner function for multimode quantum states. We demonstrate that the method is fast, accurate and more robust than conventional methods when limited amounts of data are available.
  arXiv  Detail & Related papers  (2020-03-06T18:20:01Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.