Fault-tolerant quantum error detection.

Fault-tolerant quantum error detection.
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DOI:
10.1126/sciadv.1701074
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发表时间:
2017-10
期刊:
影响因子:
13.6
通讯作者:
Monroe C
Monroe C
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Linke NM;Gutierrez M;Landsman KA;Figgatt C;Debnath S;Brown KR;Monroe C

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我们展示了通过量子错误检测的逻辑量子比特的容错编码、测量和操作。量子计算机最终将达到量子纠错变得势在必行的规模。通过在多个物理量子比特中编码单个逻辑量子比特,可以保护量子信息免受量子比特缺陷和有缺陷的控制操作的影响。这种冗余允许错误伴随式的提取以及随后的错误检测或纠正,而不会通过直接测量破坏逻辑状态本身。我们显示的编码和综合征测量的容错准备的逻辑量子位通过错误检测协议的四个物理量子位,被困原子离子。这证明了逻辑量子比特对编码操作的不完美性的鲁棒性,即使在大的附加误差率和实验校准误差面前,这种优势也会持续存在。
We show the fault-tolerant encoding, measurement, and operation of a logical qubit via quantum error detection. Quantum computers will eventually reach a size at which quantum error correction becomes imperative. Quantum information can be protected from qubit imperfections and flawed control operations by encoding a single logical qubit in multiple physical qubits. This redundancy allows the extraction of error syndromes and the subsequent detection or correction of errors without destroying the logical state itself through direct measurement. We show the encoding and syndrome measurement of a fault-tolerantly prepared logical qubit via an error detection protocol on four physical qubits, represented by trapped atomic ions. This demonstrates the robustness of a logical qubit to imperfections in the very operations used to encode it. The advantage persists in the face of large added error rates and experimental calibration errors.
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