期刊
ACM JOURNAL ON EMERGING TECHNOLOGIES IN COMPUTING SYSTEMS
卷 16, 期 3, 页码 -出版社
ASSOC COMPUTING MACHINERY
DOI: 10.1145/3386162
关键词
Error Aware compilation; Experimental Quantum Computation; Quantum Programming Tools
类别
资金
- MEXT Quantum Leap Flagship Program [JPMXS0118067285]
NISQ (Noisy, Intermediate-Scale Quantum) computing requires error mitigation to achieve meaningful computation. Our compilation tool development focuses on the fact that the error rates of individual qubits are not equal, with a goal ofmaximizing the success probability of real-world subroutines such as an adder circuit. We begin by establishing a metric for choosing among possible paths and circuit alternatives for executing gates between variables placed far apart within the processor, and test our approach on two IBM 20-qubit systems named Tokyo and Poughkeepsie. We find that a single-number metric describing the fidelity of individual gates is a useful but imperfect guide. Our compiler uses this subsystem and maps complete circuits onto the machine using a beam search-based heuristic that will scale as processor and program sizes grow. To evaluate the whole compilation process, we compiled and executed adder circuits, then calculated the Kullback-Leibler divergence (KL-divergence, a measure of the distance between two probability distributions). For a circuit within the capabilities of the hardware, our compilation increases estimated success probability and reduces KL-divergence relative to an error-oblivious placement.
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