Quantum Simulation of Generic Many-Body Open System Dynamics Using Classical Noise
Quantum Simulation of Generic Many-Body Open System Dynamics Using Classical Noise
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DOI：
10.1103/physrevlett.118.140403
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发表时间：
2017-04-05
影响因子：
8.6
通讯作者：
del Campo, A.
中科院分区：
文献类型：
--
作者：
Chenu, A.;Beau, M.;del Campo, A.
介绍了一种基于随机哈密顿量幺正演化的多体退相干量子模拟方案。调制的强度与随机过程的相互作用，我们表明，噪声平均密度矩阵模拟一个有效的开放的动态k体Lindblad运营商。马尔可夫动力学可以用白噪声波动来描述，而非马尔可夫动力学则需要有色噪声。在多体退相干下，保真度衰减的时间尺度与系统尺寸N成N-2k的比例。我们的建议可以很容易地实现在各种量子平台，包括光学晶格，超导电路，和捕获的离子。
We introduce a scheme for the quantum simulation of many-body decoherence based on the unitary evolution of a stochastic Hamiltonian. Modulating the strength of the interactions with stochastic processes, we show that the noise-averaged density matrix simulates an effectively open dynamics governed by k-body Lindblad operators. Markovian dynamics can be accessed with white-noise fluctuations; nonMarkovian dynamics requires colored noise. The time scale governing the fidelity decay under many-body decoherence is shown to scale as N-2k with the system size N. Our proposal can be readily implemented in a variety of quantum platforms including optical lattices, superconducting circuits, and trapped ions.