32

Shin Nishio, Yulu Pan, Takahiko Satoh, Hideharu Amano, Rodney Van Meter

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

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 of maximizing 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.

Original languageEnglish
Article number31
JournalACM Journal on Emerging Technologies in Computing Systems
Volume16
Issue number3
DOIs
Publication statusPublished - 2020 Jul

Keywords

  • Error Aware compilation
  • Experimental Quantum Computation
  • Quantum Programming Tools

ASJC Scopus subject areas

  • Software
  • Hardware and Architecture
  • Electrical and Electronic Engineering

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