Confining the state of light to a quantum manifold by engineered two-photon loss
Confining the state of light to a quantum manifold by engineered two-photon loss
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DOI：
10.1126/science.aaa2085
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发表时间：
2015-02-20
期刊：
影响因子：
56.9
通讯作者：
Devoret, M. H.
中科院分区：
文献类型：
--
作者：
Leghtas, Z.;Touzard, S.;Devoret, M. H.
物理系统通常只有在与有损环境充分解耦时才会表现出量子行为，例如叠加和纠缠。巧合的是，与环境的特殊设计的相互作用可以成为量子态产生和保护的资源。这个概念可以推广到将一个系统限制在多个量子态中，这些量子态由多个稳定稳态的所有相干叠加组成。我们将超导谐振腔的态限制在由两个相位相反的相干态构成的量子流形上，并观察到薛定谔猫态在衰变成经典混合态之前自发地从真空中挤出。这个实验指向在多维稳态流形中稳健地编码量子信息。
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 Schrodinger cat state spontaneously squeeze out of vacuum before decaying into a classical mixture. This experiment points toward robustly encoding quantum information inmultidimensional steady-state manifolds.