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

Zaki Leghtas 1 Steven Touzard 1 Ioan M. Pop 1 Angela Kou 1 Brian Vlastakis 1 Andrei Petrenko 1 Katrina M. Sliwa 1 Anirudh Narla 1 Shyam Shankar 1 Michael J. Hatridge 1 Matthew Reagor 1 Luigi Frunzio 1 Robert J. Schoelkopf 1 Mazyar Mirrahimi 2 Michel H. Devoret 1
2 QUANTIC - QUANTum Information Circuits
ENS Paris - École normale supérieure - Paris, Inria Paris-Rocquencourt, UPMC - Université Pierre et Marie Curie - Paris 6, MINES ParisTech - École nationale supérieure des mines de Paris, CNRS - Centre National de la Recherche Scientifique : UMR8551
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.
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https://hal.inria.fr/hal-01240210
Contributor : Mazyar Mirrahimi <>
Submitted on : Tuesday, December 8, 2015 - 6:15:28 PM
Last modification on : Wednesday, May 15, 2019 - 3:43:43 AM

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Zaki Leghtas, Steven Touzard, Ioan M. Pop, Angela Kou, Brian Vlastakis, et al.. Confining the state of light to a quantum manifold by engineered two-photon loss. Science, American Association for the Advancement of Science, 2015, 347 (6224), pp.853-857 ⟨10.1126/science.aaa2085⟩. ⟨hal-01240210⟩

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