Toward a multi-core ultra-fast optical quantum processor: 43-GHz bandwidth real-time amplitude measurement of 5-dB squeezed light using modularized optical parametric amplifier with 5G technology

Author:

Inoue A.1ORCID,Kashiwazaki T.1ORCID,Yamashima T.2ORCID,Takanashi N.2ORCID,Kazama T.1ORCID,Enbutsu K.1ORCID,Watanabe K.1,Umeki T.1ORCID,Endo M.23ORCID,Furusawa A.23ORCID

Affiliation:

1. NTT Device Technology Labs, NTT Corporation 1 , 3-1, Morinosato Wakamiya, Atsugi, Kanagawa 243-0198, Japan

2. Department of Applied Physics, School of Engineering, The University of Tokyo 2 , 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan

3. Optical Quantum Computing Research Team, RIKEN Center for Quantum Computing 3 , 2-1, Hirosawa, Wako, Saitama 351-0198, Japan

Abstract

Continuous-variable optical quantum information processing, where quantum information is encoded in a traveling wave of light called a flying qubit, is a candidate for a practical quantum computer with high clock frequencies. Homodyne detectors for quadrature-phase amplitude measurements have been the major factor limiting the clock frequency. Here, we developed a real-time amplitude measurement method using a modular optical parametric amplifier (OPA) and a broadband balanced photodiode that is commercially used for coherent wavelength-division multiplexing telecommunication of the fifth-generation mobile communication systems (5G). The OPA amplifies one quadrature-phase component of the quantum-level signal to a loss-tolerant macroscopic level and suppresses the loss after the OPA from 92.4% to only 0.4%. This method was applied to a broadband squeezed vacuum measurement with a center wavelength of 1545.32 nm. In the time-domain measurement, the squeezing level of 5.1 ± 0.1 dB without loss correction was obtained by a real-time oscilloscope with a sampling rate of 160 GHz and an analog bandwidth of 63 GHz. The frequency-domain analysis also shows that a squeezing level of 5.2 ± 0.5 dB is obtained from DC to 43 GHz, which is limited by the balanced detector. This indicates that the proposed method can be easily broadened by using a broader bandwidth measurement instrument. By applying this method, not only can optical quantum computers with high clock frequencies be realized but also multi-core systems can be realized.

Funder

Moonshot Research and Development Program

Japan Society for the Promotion of Science

Publisher

AIP Publishing

Subject

Physics and Astronomy (miscellaneous)

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