Real-Time Quadrature Measurement of a Highly Pure Single-Photon State in an Exponentially Rising Wave Packet

Ogawa, Hisashi; Ohdan, Hideaki; Taguchi, Masahiro; Makino, Kenzo; Yonezawa, Hidehiro; Yoshikawa, Jun–ichi; Furusawa, Akira

doi:10.1364/fio.2015.fw5a.4

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2016

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“…Potentially, such a superposition state can be stored in and retrieved from recently-developed optical quantum memories [22,23]. In order to make resource nonclassical states compatible with the measurement-based scheme, real-time quadrature measurement of a single-photon state has been demonstrated [24].…”

Section: Introductionmentioning

confidence: 99%

Implementation of a quantum cubic gate by an adaptive non-Gaussian measurement

et al. 2016

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We present a concept of non-Gaussian measurement composed of a non-Gaussian ancillary state, linear optics and adaptive heterodyne measurement, and on the basis of this we also propose a simple scheme of implementing a quantum cubic gate on a traveling light beam. In analysis of the cubic gate in the Heisenberg representation, we find that nonlinearity of the gate is independent from nonclassicality; the nonlinearity is generated solely by a classical nonlinear adaptive control in a measurement-and-feedforward process while the nonclassicality is attached by the non-Gaussian ancilla that suppresses excess noise in the output. By exploiting the noise term as a figure of merit, we consider the optimum non-Gaussian ancilla that can be prepared within reach of current technologies and discuss performance of the gate. It is a crucial step towards experimental implementation of the quantum cubic gate.

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Section: Introductionmentioning

confidence: 99%