Parallelizing quantum circuits

Anne Broadbent, Elham Kashefi

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

We present a novel automated technique for parallelizing quantum circuits via the forward and backward translation to measurement-based quantum computing patterns, and analyze the trade off in terms of depth and space complexity. As a result we distinguish a class of polynomial depth circuits that can be parallelized to logarithmic depth while adding only a polynomial number of auxiliary qubits. In particular, we provide for the first time a full characterization of patterns with flow of arbitrary depth, based on the notion of influencing walks and a simple rewriting system on the angles of the measurement. Our method provides new insight for constructing parallel circuits and as applications, we demonstrate several classes of circuits that can be parallelized to constant or logarithmic depth. Furthermore, we prove a logarithmic separation in terms of quantum depth between the quantum circuit model and the measurement-based model.
Original languageEnglish
Pages (from-to)2489-2510
Number of pages22
JournalTheoretical Computer Science
Issue number26
Publication statusPublished - 2009

Keywords / Materials (for Non-textual outputs)

  • Measurement calculus
  • Quantum circuits


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