6533b85bfe1ef96bd12bab10

RESEARCH PRODUCT

Quantum Nondemolition Gate Operations and Measurements in Real Time on Fluctuating Signals

Shuntaro TakedaShuntaro TakedaTakahiro SerikawaAkira FurusawaPeter Van LoockRyosuke NakamuraShigenari SuzukiWarit AsavanantJun-ichi YoshikawaShota YamazakiShota YokoyamaShota YokoyamaToshiyuki KajiYu ShiozawaKenzo Makino

subject

PhysicsQuantum PhysicsSidebandBandwidth (signal processing)FOS: Physical sciencesQuantum Physics01 natural sciences010309 opticsLinear opticsComputer Science::Hardware ArchitectureComputer Science::Emerging TechnologiesQuantum error correctionQuantum stateQuantum mechanics0103 physical sciencesHardware_INTEGRATEDCIRCUITS010306 general physicsQuantum Physics (quant-ph)Quantum

description

We demonstrate an optical quantum nondemolition (QND) interaction gate with a bandwidth of about 100 MHz. Employing this gate, we are able to perform QND measurements in real time on randomly fluctuating signals. Our QND gate relies on linear optics and offline-prepared squeezed states. In contrast to previous demonstrations on narrow sideband modes, our gate is compatible with quantum states temporally localized in a wave-packet mode including non-Gaussian quantum states. This is the cornerstone of realizing quantum error correction and universal gate operations.

yearjournalcountryeditionlanguage
2017-12-22
10.1103/physreva.98.052311http://arxiv.org/abs/1712.08411