Engineering Schrödinger cat states with a photonic even-parity detector

Author:

Thekkadath G. S.1,Bell B. A.1,Walmsley I. A.1,Lvovsky A. I.12

Affiliation:

1. Clarendon Laboratory, University of Oxford, Parks Road, Oxford, OX1 3PU, UK

2. Russian Quantum Center, 100 Novaya St., Skolkovo, Moscow 143025, Russia

Abstract

When two equal photon-number states are combined on a balanced beam splitter, both output ports of the beam splitter contain only even numbers of photons. Consider the time-reversal of this interference phenomenon: the probability that a pair of photon-number-resolving detectors at the output ports of a beam splitter both detect the same number of photons depends on the overlap between the input state of the beam splitter and a state containing only even photon numbers. Here, we propose using this even-parity detection to engineer quantum states containing only even photon-number terms. As an example, we demonstrate the ability to prepare superpositions of two coherent states with opposite amplitudes, i.e. two-component Schrödinger cat states. Our scheme can prepare cat states of arbitrary size with nearly perfect fidelity. Moreover, we investigate engineering more complex even-parity states such as four-component cat states by iteratively applying our even-parity detector.

Publisher

Verein zur Forderung des Open Access Publizierens in den Quantenwissenschaften

Subject

Physics and Astronomy (miscellaneous),Atomic and Molecular Physics, and Optics

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