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arXiv 2201.13319quant-phcond-mat.stat-mech
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在量子处理单元上纯化量子比特的量子热力学方法

Quantum thermodynamic methods to purify a qubit on a quantum processing unit

Andrea Solfanelli, Alessandro Santini, Michele Campisi

摘要:

我们报道了一种量子热力学方法,在配备有(几乎)相同量子位的量子处理单元(QPU)上纯化量子位。我们的出发点是一个三量子位的设计,它模拟了众所周知的两量子位交换引擎。与标准冰箱类似,该方法将允许以加热另外两个量子位为代价来冷却一个量子位。其最小的修改导致更实用的三量子位设计,其允许增强的制冷任务,例如以降低其他两个量子位的纯度为代价来增加一个量子位的纯度。该方法基于适当设计的量子线路的应用,因此可以在任何门模型量子计算机上运行。我们实现了它在一个公开的超导量子比特的QPU,并观察到净化能力下降到200 mK。我们认为门噪声是量子计算实际应用的主要障碍。

英文摘要:

We report on a quantum thermodynamic method to purify a qubit on a quantum processing unit (QPU) equipped with (nearly) identical qubits. Our starting point is a three qubit design that emulates the well known two qubit swap engine. Similar to standard fridges, the method would allow to cool down a qubit at the expense of heating two other qubits. A minimal modification thereof leads to a more practical three qubit design that allows for enhanced refrigeration tasks, such as increasing the purity of one qubit at the expense of decreasing the purity of the other two. The method is based on the application of properly designed quantum circuits, and can therefore be run on any gate model quantum computer. We implement it on a publicly available superconducting qubit based QPU, and observe a purification capability down to 200 mK. We identify gate noise as the main obstacle towards practical application for quantum computing.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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