Cited by 143Quantum Computing Algorithms and ArchitectureQuantum Information and CryptographyQuantum Mechanics and Applications

Efficient Synthesis of Universal Repeat-Until-Success Quantum Circuits

Open access
Bocharov, Alex, Roetteler, Martin, Svore, Krysta M.·2015·Physical Review Letters

Abstract

Recently it was shown that the resources required to implement unitary operations on a quantum computer can be reduced by using probabilistic quantum circuits called repeat-until-success (RUS) circuits. However, the previously best-known algorithm to synthesize a RUS circuit for a given target unitary requires exponential classical runtime. We present a probabilistically polynomial-time algorithm to synthesize a RUS circuit to approximate any given single-qubit unitary to precision ϵ over the Clifford+T basis. Surprisingly, the T count of the synthesized RUS circuit surpasses the theoretical lower bound of 3 log_{2}(1/ϵ) that holds for purely unitary single-qubit circuit decomposition. By taking advantage of measurement and an ancilla qubit, RUS circuits achieve an expected T count of 1.15 log_{2}(1/ϵ) for single-qubit z rotations. Our method leverages the fact that the set of unitaries implementable by RUS protocols has a higher density in the space of all unitaries compared to the density of purely unitary implementations.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1103/physrevlett.114.080502

Cites

22 of 22 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • The sequence of classically controlled phase shifts can be combined into a single shift and implemented to a level of precision far below other sources of error without noticeable cost.

    “This sequence can be combined into a single shift, and implemented using e.g. the technique in [10], to a level of precision far below other sources of error in the algorithm without incurring a noticeable cost.”

    From How to factor 2048 bit RSA integers in 8 hours using 20 million noisy qubits (2021) · cites this paper as [10]

    The circuit-synthesis discussion (p. 3) describes approximating an arbitrary phase to a chosen precision, and the Conclusions (p. 4) report that expected T-count grows logarithmically with inverse precision. The paper does not compare that cost with other sources of error in the citing algorithm, so it does not establish that the required precision incurs no noticeable cost. The combination into a single shift is presented as the citing authors’ step, not as a result attributed to this source. (LLM, conf=0.84)

    Experimental — accuracy not yet measured

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Bocharov, A., Roetteler, M., & Svore, K. M.
Affiliations
Microsoft (United States) (US)
Venue
Physical Review Letters
Published
2015-02-27
Volume
114
Issue
8
Pages
080502-080502
ISSN
  • 0031-9007 (ISSN-L)
  • 1079-7114
OpenAlex
W1915167278
Cited by
142
References
22
Citations by year
2026: 8 · 2025: 17 · 2024: 16 · 2023: 12 · 2022: 15 · 2021: 12 · 2020: 13 · 2019: 10 · 2018: 6 · 2017: 12 · 2016: 12 · 2015: 8 · 2014: 1
FWCI
12.43
Type
journal article
Language
en
Open access
Locations
  • Physical Review Letters (publishedVersion)
  • PubMed (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • arXiv (Cornell University)
Topics
  • Physical Sciences › Computer Science › Artificial Intelligence › Quantum Computing Algorithms and Architecture
  • Physical Sciences › Computer Science › Artificial Intelligence › Quantum Information and Cryptography
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum Mechanics and Applications
Keywords
quantum circuit synthesis, T-count, ancilla qubits, measurement, quantum resource reduction

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review