Enlargement of optical Schrödinger's cat states

Autor: Anastasia A. Pushkina, A. I. Lvovsky, Alexander E. Ulanov, Ilya A. Fedorov, Demid V. Sychev, Matthew W. Richards
Rok vydání: 2017
Předmět:
Zdroj: Nature Photonics. 11:379-382
ISSN: 1749-4893
1749-4885
DOI: 10.1038/nphoton.2017.57
Popis: Superpositions of macroscopically distinct quantum states, introduced in Schrodinger's famous Gedankenexperiment, are an epitome of quantum ‘strangeness’ and a natural tool for determining the validity limits of quantum physics. The optical incarnation of Schrodinger'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 ∼0.2. 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. The amplitude of a Schrodinger's cat (SC) state — superposed coherent state — is increased using a homodyne measurement. A pair of negative SC states with amplitude of 1.15 is probabilistically converted to a single positive SC state with amplitude of 1.85.
Databáze: OpenAIRE
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