Affordable Access

deepdyve-link
Publisher Website

Matchgate quantum computing and non-local process analysis

Authors
  • Ramelow, S.
  • Fedrizzi, A.
  • Steinberg, A. M.
  • White, A. G.
Type
Published Article
Publication Date
Mar 03, 2011
Submission Date
Sep 16, 2009
Identifiers
DOI: 10.1088/1367-2630/12/8/083027
Source
arXiv
License
Yellow
External links

Abstract

In the circuit model, quantum computers rely on the availability of a universal quantum gate set. A particularly intriguing example is a set of two-qubit only gates: matchgates, along with SWAP (the exchange of two qubits). In this paper, we show a simple decomposition of arbitrary matchgates into better known elementary gates, and implement a matchgate in a linear-optics experiment using single photons. The gate performance was fully characterized via quantum process tomography. Moreover, we represent the resulting reconstructed quantum process in a novel way, as a fidelity map in the space of all possible nonlocal two-qubit unitaries. We propose the non-local distance - which is independent of local imperfections like uncorrelated noise or uncompensated local rotations - as a new diagnostic process measure for the non-local properties of the implemented gate.

Report this publication

Statistics

Seen <100 times