Integrated photonic platform for quantum information with continuous variables

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Lenzini, Francesco
Janousek, Jiri
Thearle, Oliver
Villa, Matteo
Haylock, Ben
Kasture, Sachin
Cui, Liang
Hoang-Phuong, Phan
Dzung, Viet Dao
Yonezawa, Hidehiro
Lam, Ping Koy
Huntington, Elanor H
Lobino, Mirko
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2018
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Abstract

Integrated quantum photonics provides a scalable platform for the generation, manipulation, and detection of optical quantum states by confining light inside miniaturized waveguide circuits. Here, we show the generation, manipulation, and interferometric stage of homodyne detection of nonclassical light on a single device, a key step toward a fully integrated approach to quantum information with continuous variables. We use a dynamically reconfigurable lithium niobate waveguide network to generate and characterize squeezed vacuum and two-mode entangled states, key resources for several quantum communication and computing protocols. We measure a squeezing level of − 1.38 ± 0.04 dB and demonstrate entanglement by verifying an inseparability criterion I = 0.77 ± 0.02 < 1. Our platform can implement all the processes required for optical quantum technology, and its high nonlinearity and fast reconfigurability make it ideal for the realization of quantum computation with time encoded continuous-variable cluster states.

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Science Advances

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4

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12

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Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Quantum optics and quantum optomechanics

Integrated quantum photonics

Optical quantum states

Miniaturized waveguide circuits

Homodyne detection

Continuous variables

Quantum information

Lithium niobate waveguide network

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