Journal
PHYSICAL REVIEW APPLIED
Volume 15, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevApplied.15.024024
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Funding
- JSPS KAKENHI [18H05207, 18H01149, 20K15187]
- Core Research for Evolutional Science and Technology (CREST) of the Japan Science and Technology Agency (JST) [JPMJCR15N5]
- UTokyo Foundation
- Czech Science Foundation [GA18-21285S]
- MEYS
- European Union [731473, 8C20002 ShoQC]
- QuantERA ERA-NET Cofund in Quantum Technologies implemented within the European Union's Horizon 2020 program
- Grants-in-Aid for Scientific Research [20K15187, 18H01149, 18H05207] Funding Source: KAKEN
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In this paper, a superposition between a vacuum state and a single-photon state with maximized nonlinear squeezing is generated and observed in real-time quadrature measurements. This work presents an important step in extending continuous-variable quantum information processing from the Gaussian regime to the non-Gaussian regime.
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.
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