论文标题

逻辑随机基准测试中的非指数行为

Non-Exponential Behaviour in Logical Randomized Benchmarking

论文作者

Ceasura, Athena, Iyer, Pavithran, Wallman, Joel J., Pashayan, Hakop

论文摘要

我们构建了一个栅极和无关的噪声模型,该模型导致逻辑随机基准测试协议振荡的输出,而不是呈指数衰减。为了说明我们的想法,我们首先在标准的随机基准测试中构建了一个示例,其中我们假设存在``隐藏''Qubits的存在,从而可以选择包含多重性的Clifford组的表示。我们使用每个门应用程序来更新我们用来规避定理的门历史记录的隐藏内存,以确保输出呈指数衰减。在逻辑随机基准测试的焦点设置中,我们表明与实现量子误差校正相关的机械的存在可以促进非指数衰减。由于,在逻辑随机基准测试中,将隐藏量子位的作用分配给了误差校正中使用的综合征Qubits,并且通过解码器将其强烈耦合到逻辑Qubits。

We construct a gate and time-independent noise model that results in the output of a logical randomized benchmarking protocol oscillating rather than decaying exponentially. To illustrate our idea, we first construct an example in standard randomized benchmarking where we assume the existence of ``hidden'' qubits, permitting a choice of representation of the Clifford group that contains multiplicities. We use the multiplicities to, with each gate application, update a hidden memory of the gate history that we use to circumvent theorems which guarantee the output decays exponentially. In our focal setting of logical randomized benchmarking, we show that the presence of machinery associated with the implementation of quantum error correction can facilitate non-exponential decay. Since, in logical randomized benchmarking, the role of the hidden qubits is assigned to the syndrome qubits used in error correction and these are strongly coupled to the logical qubits via a decoder.

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