Frontiers in Optics

Single-Pass Generation of Spatial and Spectral Multimode Squeezed States of Light

Tiphaine Kouadou, Luca La Volpe, Syamsundar De, Claude Fabre, Valentina Parigi, Nicolas Treps

Published Jan 1, 2019• 2 citations

Abstract

We show the single-pass generation of entangled states featuring spatial-spectral quantum correlations via SPDC. They constitute multimode building blocks of dual-rail cluster states, which can be achieved via multiplexing in the time (pulsed) domain.

DOI: 10.1364/fio.2019.fth3b.7

Related papers

A Single-Pass Quantum Source of Multimode Squeezed States of Light

Luca La Volpe, Syamsundar De, Tiphaine Kouadou +3 more

We present a parametric down-conversion based source generating broadband squeezed light in multiple spectral modes. The source will be used to create large-scale cluster states, and to perform space-time positioning measurements beyond classical limit.

Frontiers in OpticsJan 1, 20180 citations

Spectrally shaped and pulse-by-pulse multiplexed multimode squeezed states of light

Tiphaine Kouadou, Francesca Sansavini, Matthieu Ansquer +3 more

Spectral- and time-multiplexing are currently explored to generate large multipartite quantum states of light for quantum technologies. In the continuous variable approach, the deterministic generation of scalable entangled states requires the generation of a scalable number of squeezed modes. Here, we demonstrate the simultaneous generation of 21 squeezed spectral modes at the repetition rate of our laser, i.e., 156 MHz. We exploit the full repetition rate and the pulse shaping of a femtosecond light source to combine, for the first time, frequency- and time-multiplexing in multimode squeezing. This paves the way for the implementation of multipartite entangled states that are both scalable and fully reconfigurable.

arXiv:2209.10678APL PhotonicsAug 1, 202336 citations

A Single-Pass Quantum Source of Multimode Squeezed States of Light

Luca La Volpe, Syamsundar De, Tiphaine Kouadou +3 more

We present a theoretical and experimental analysis of our parametric down-conversion based source generating broadband squeezed light in multiple spectral modes. The source will be used to create large-scale cluster states, and to perform space-time positioning measurements beyond classical limit.

European Conference on Optical CommunicationSep 1, 20181 citation

Single-pass femtosecond parametric process towards continuous variables quantum networks

Tiphaine Kouadou, Francesca Sansavini, Matthieu Ansquer +3 more

We demonstrate the generation of 21 squeezed spectral modes at 156 MHz, combining frequency- and time- multiplexing in multimode squeezing. This paves the way to the implementation of scalable and fully reconfigurable multipartite entangled states.

Jan 1, 20230 citations

Multimode squeezed state for reconfigurable quantum networks at telecommunication wavelengths

Victor Roman Rodriguez, David Fainsin, Guilherme Luiz Zanin +3 more

Continuous variable encoding of quantum information requires the deterministic generation of highly correlated quantum states of light in the form of quantum networks, which, in turn, necessitates the controlled generation of a large number of squeezed modes. In this paper, we present an experimental source of multimode squeezed states of light at telecommunication wavelengths. Generation at such wavelengths is especially important as it can enable quantum information processing, communication, and sensing beyond the laboratory scale. We use a single-pass spontaneous parametric down-conversion process in a nonlinear waveguide pumped with the second harmonic of a femtosecond laser. Our measurements reveal significant squeezing in more than 21 frequency modes, with a maximum squeezing value exceeding 2.5 dB. We demonstrate multiparty entanglement by measuring the state's covariance matrix. Finally, we show the source reconfigurability by preparing few-node cluster states and measure their nullifier squeezing level. These results pave the way for a scalable implementation of continuous variable quantum information protocols at telecommunication wavelengths, particularly for multiparty, entanglement-based quantum communications. Moreover, the source is compatible with additional pulse-by-pulse multiplexing, which can be utilized to construct the necessary three-dimensional entangled structures for quantum computing protocols. Published by the American Physical Society 2024

arXiv:2306.07267Physical Review ResearchNov 7, 202427 citations

Multimode squeezed light generation and characterization

Alexander Chudakov, Vladislav Severin, Anastasia Poshevkina +5 more

Nowadays, the realization of quantum computations and communications based on continuous variables has attracted a significant attention due to a substantial expansion of the system dimensionality. The main progress in this area is attributed to the implementation of multimode systems based on squeezed states of light. One of the simplest ways to generate such states relies upon their producing in a single-pass optical parametric amplifier (OPA) using ultrafast pumping. However, for homodyne detection of such multimode states, the profile of the local oscillator (LO) must perfectly match the profile of the measured mode. Usually, this is not the case; therefore a proper treatment of multimode squeezing is required. In this work, we study both theoretically and experimentally the multimode squeezed light generated in type-0 and type-II OPA. We characterize such sources and investigate the degree of squeezing in dependence on the LO spectral profile, employing a pulse shaping technique. The theoretical analysis is performed using the Schmidt-mode theory. This work might have a significant impact on the realization of multimode quantum protocols

quant-pharXiv:2609.08591Sep 9, 20260 citations