Publications by Alexander Lvovsky

Enlargement of optical Schrödinger's cat states

Nature Photonics 11 (2017) 379-382

DV Sychev, AE Ulanov, AA Pushkina, MW Richards, IA Fedorov, AI Lvovsky

© 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Superpositions of macroscopically distinct quantum states, introduced in Schrödinger's famous Gedankenexperiment, are an epitome of quantum â € strangeness' and a natural tool for determining the validity limits of quantum physics. The optical incarnation of Schrödinger's cat (SC) - the superposition of two opposite-amplitude coherent states - is also the backbone of continuous-variable quantum information processing. However, the existing preparation methods limit the amplitudes of the component coherent states, which curtails the state's usefulness for fundamental and practical applications. Here, we convert a pair of negative squeezed SC states of amplitude 1.15 to a single positive SC state of amplitude 1.85 with a success probability of â 1/40.2. The protocol consists in bringing the initial states into interference on a beamsplitter and a subsequent heralding quadrature measurement in one of the output channels. Our technique can be realized iteratively, so arbitrarily high amplitudes can, in principle, be reached.

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