Simulation of Thermal Relaxation in Spin Chemistry Systems on a Quantum Computer Using Inherent Qubit Decoherence
Simulation of Thermal Relaxation in Spin Chemistry Systems on a Quantum Computer Using Inherent Qubit Decoherence
复制标题
使用固有量子位退相干在量子计算机上模拟自旋化学系统中的热弛豫
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
J. Nabrzyski
中科院分区：
文献类型：
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作者：
Brian Rost;B. Jones;M. Vyushkova;Aaila Ali;Charlotte Cullip;A. Vyushkov;J. Nabrzyski
当前和近期的量子计算机（即NISQ设备）在其计算能力方面受到限制，部分原因是量子位退相干。在这里，我们试图利用量子比特退相干作为一种资源，在模拟的行为，真实的世界的量子系统，这总是受到退相干，没有额外的计算开销。作为实现这一目标的第一步，我们在量子计算机上模拟自由基离子对（RP）中量子拍频的热弛豫，作为该方法的概念证明。我们提出了三种实现热弛豫的方法，一种是明确地应用弛豫Kraus算子，一种是在经典的后处理步骤中将两个独立电路的结果结合起来，另一种是依赖于利用量子比特本身固有的退相干。我们使用我们的方法来模拟两个真实的世界系统，并找到我们的结果，实验数据和理论预测之间的良好协议。
Current and near term quantum computers (i.e. NISQ devices) are limited in their computational power in part due to qubit decoherence. Here we seek to take advantage of qubit decoherence as a resource in simulating the behavior of real world quantum systems, which are always subject to decoherence, with no additional computational overhead. As a first step toward this goal we simulate the thermal relaxation of quantum beats in radical ion pairs (RPs) on a quantum computer as a proof of concept of the method. We present three methods for implementing the thermal relaxation, one which explicitly applies the relaxation Kraus operators, one which combines results from two separate circuits in a classical post-processing step, and one which relies on leveraging the inherent decoherence of the qubits themselves. We use our methods to simulate two real world systems and find excellent agreement between our results, experimental data, and the theoretical prediction.