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

Kazunori Miyata, Hisashi Ogawa, Petr Marek, Radim Filip, Hidehiro Yonezawa, Jun-ichi Yoshikawa, and Akira Furusawa
Phys. Rev. A 93, 022301 – Published 1 February 2016

Abstract

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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  • Received 31 July 2015

DOI:https://doi.org/10.1103/PhysRevA.93.022301

©2016 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & Technology

Authors & Affiliations

Kazunori Miyata1,*, Hisashi Ogawa1, Petr Marek2, Radim Filip2, Hidehiro Yonezawa3, Jun-ichi Yoshikawa1, and Akira Furusawa1,†

  • 1Department of Applied Physics, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
  • 2Department of Optics, Palacký University, 17. listopadu 1192/12, 77146 Olomouc, Czech Republic
  • 3Centre for Quantum Computation and Communication Technology, School of Engineering and Information Technology, University of New South Wales Canberra, Australian Capital Territory 2610, Australia

  • *miyata@alice.t.u-tokyo.ac.jp
  • akiraf@ap.t.u-tokyo.ac.jp

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Issue

Vol. 93, Iss. 2 — February 2016

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