Publications by Brian Vlastakis

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

Science (New York, N.Y.) 347 (2015) 853-857

Z Leghtas, S Touzard, IM Pop, A Kou, B Vlastakis, A Petrenko, KM Sliwa, A Narla, S Shankar, MJ Hatridge, M Reagor, L Frunzio, RJ Schoelkopf, M Mirrahimi, MH Devoret

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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