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Science. 2015 Feb 20;347(6224):853-7. doi: 10.1126/science.aaa2085.

Quantum engineering. Confining the state of light to a quantum manifold by engineered two-photon loss.

Author information

1
Department of Applied Physics, Yale University, New Haven, CT 06520, USA. zaki.leghtas@yale.edu.
2
Department of Applied Physics, Yale University, New Haven, CT 06520, USA.
3
Institut National de Recherche en Informatique et en Automatique (INRIA) Paris-Rocquencourt, Domaine de Voluceau, B.P. 105, 78153 Le Chesnay Cedex, France. Department of Applied Physics, Yale University, New Haven, CT 06520, USA.

Abstract

Physical systems usually exhibit quantum behavior, such as superpositions and entanglement, only when they are sufficiently decoupled from a lossy environment. Paradoxically, a specially engineered interaction with the environment can become a resource for the generation and protection of quantum states. This notion can be generalized to the confinement of a system into a manifold of quantum states, consisting of all coherent superpositions of multiple stable steady states. We have confined the state of a superconducting resonator to the quantum manifold spanned by two coherent states of opposite phases and have observed a Schrödinger cat state spontaneously squeeze out of vacuum before decaying into a classical mixture. This experiment points toward robustly encoding quantum information in multidimensional steady-state manifolds.

PMID:
25700514
DOI:
10.1126/science.aaa2085
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