Exploring quantum phases by driven dissipation
Exploring quantum phases by driven dissipation
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DOI：
10.1103/physreva.92.012128
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发表时间：
2014-08
影响因子：
2.9
通讯作者：
Nicolai Lang;H. P. Buchler
中科院分区：
文献类型：
--
作者：
Nicolai Lang;H. P. Buchler
退相和衰变是任何开放量子系统中普遍存在的内在耗散过程，也是导致相干损失和纠缠的主要机制。这种无意的影响不仅可以克服，甚至可以通过量子系统和环境之间的量身定制的耦合，在耗散量子模拟中加以利用。在这一背景下，已经证明了可以使用纯耗散元素来进行普遍的量子计算，而且，高效地制备高度纠缠态是可能的。在这篇文章中，我们感兴趣的是出现在纯耗散系统中的非平衡相变，以及用耗散量子模拟来探索量子相。为了阐明这些概念，我们典型地考察了两个典型模型：横场伊辛模型和更为复杂的格点规范理论。我们证明了非平衡相图与哈密顿“蓝图”理论的量子相图是平行的。
Dephasing and decay are the intrinsic dissipative processes prevalent in any open quantum system and the dominant mechanisms for the loss of coherence and entanglement. This inadvertent effect not only can be overcome but can even be capitalized on in a dissipative quantum simulation by means of tailored couplings between the quantum system and the environment. In this context it has been demonstrated that universal quantum computation can be performed using purely dissipative elements, and furthermore, the efficient preparation of highly entangled states is possible. In this article, we are interested in nonequilibrium phase transitions appearing in purely dissipative systems and the exploration of quantum phases in terms of a dissipative quantum simulation. To elucidate these concepts, we scrutinize exemplarily two paradigmatic models: the transverse-field Ising model and the considerably more complex ${\mathbb{Z}}_{2}$ lattice gauge theory. We show that the nonequilibrium phase diagrams parallel the quantum phase diagrams of the Hamiltonian ``blueprint'' theories.