Real-Time Quadrature Measurement of a Single-Photon Wave Packet with Continuous Temporal-Mode Matching

Hisashi Ogawa, Hideaki Ohdan, Kazunori Miyata, Masahiro Taguchi, Kenzo Makino, Hidehiro Yonezawa, Jun-ichi Yoshikawa, and Akira Furusawa

Phys. Rev. Lett. 116, 233602 – Published 8 June 2016

Abstract

Real-time controls based on quantum measurements are powerful tools for various quantum protocols. However, their experimental realization has been limited by mode mismatch between the temporal mode of quadrature measurement and that heralded by photon detection. Here, we demonstrate real-time quadrature measurement of a single-photon wave packet induced by photon detection by utilizing continuous temporal-mode matching between homodyne detection and an exponentially rising temporal mode. Single photons in exponentially rising modes are also expected to be useful resources for interactions with other quantum systems.

Received 22 July 2015

DOI:https://doi.org/10.1103/PhysRevLett.116.233602

Physics Subject Headings (PhySH)

Quantum information processing with continuous variables Quantum measurements Quantum optics

Homodyne & heterodyne detection

Atomic, Molecular & OpticalQuantum Information, Science & Technology

Authors & Affiliations

Hisashi Ogawa¹, Hideaki Ohdan¹, Kazunori Miyata¹, Masahiro Taguchi¹, Kenzo Makino¹, Hidehiro Yonezawa², Jun-ichi Yoshikawa¹, and Akira Furusawa^1,*

¹Department of Applied Physics, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
²Centre for Quantum Computation and Communication Technology, School of Engineering and Information Technology, University of New South Wales, Canberra, Australian Capital Territory 2600, Australia