论文标题
在量子处理单元上净化量子的量子热力学方法
Quantum thermodynamic methods to purify a qubit on a quantum processing unit
论文作者
论文摘要
我们报告了一种量子热力学方法，该方法可以在配备（几乎）相同QUBIT的量子处理单元（QPU）上净化量子。我们的起点是三个Qubit设计，该设计模仿了众所周知的两个Qubit交换引擎。与标准冰箱相似，该方法将允许以加热两个量子位的费用冷却量子。最小的修改导致更实用的三个量子设计，该设计允许增强制冷任务，例如以降低其他两个量子的纯度为代价，增加了一个量子的纯度。该方法基于适当设计的量子电路的应用，因此可以在任何门型量子计算机上运行。我们以基于公开的超导量子QPU实现它，并观察到净化能力低至200 MK。我们将门噪声确定为实用量子计算应用的主要障碍。
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.
