Nonlinear Squeezing for Measurement-Based Non-Gaussian Operations in Time Domain

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F21%3A73606674" target="_blank" >RIV/61989592:15310/21:73606674 - isvavai.cz</a>
Result on the web
<a href="https://journals.aps.org/prapplied/pdf/10.1103/PhysRevApplied.15.024024" target="_blank" >https://journals.aps.org/prapplied/pdf/10.1103/PhysRevApplied.15.024024</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevApplied.15.024024" target="_blank" >10.1103/PhysRevApplied.15.024024</a>

Result language
angličtina
Original language name
Nonlinear Squeezing for Measurement-Based Non-Gaussian Operations in Time Domain
Original language description
Quantum non-Gaussian gate is a missing piece to the realization of continuous-variable universal quantum operations in an optical system. In a measurement-based implementation of the cubic phase gate, a lowest-order non-Gaussian gate, non-Gaussian ancillary states that have a property we call nonlinear squeezing are required. This property, however, has never been experimentally verified. In this paper, we generate a superposition between a vacuum state and a single-photon state whose nonlinear squeezing is maximized by the optimization of the superposition coefficients. The nonlinear squeezing is observed via real-time quadrature measurements, meaning that the generated states are compatible with real-time feedforward and are suitable as ancillary states for the cubic phase gate in the time domain. Moreover, by increasing the number of photons, it is expected that nonlinear squeezing can be further improved. The idea presented here can be readily extended to higher-order phase gates [P. Marek et al., Phys. Rev. A 97, 022329 (2018)]. As such, this work presents an important step to extend continuous-variable quantum information processing from Gaussian regime to non-Gaussian regime.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10306 - Optics (including laser optics and quantum optics)

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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