Nonreversal and nonrepeating quantum walks

T. J. Proctor, K. E. Barr, B. Hanson, S. Martiel, V. Pavlović, A. Bullivant, V. M. Kendon

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

We introduce a variation of the discrete-time quantum walk, the nonreversal quantum walk, which does not step back onto a position that it has just occupied. This allows us to simulate a dimer and we achieve it by introducing a different type of coin operator. The nonrepeating walk, which never moves in the same direction in consecutive time steps, arises by a permutation of this coin operator. We describe the basic properties of both walks and prove that the even-order joint moments of the nonrepeating walker are independent of the initial condition, being determined by five parameters derived from the coin instead. Numerical evidence suggests that the same is the case for the nonreversal walk. This contrasts strongly with previously studied coins, such as the Grover operator, where the initial condition can be used to control the standard deviation of the walker.
Original languageEnglish
Article number042332
Number of pages8
JournalPhysical Review A
Volume89
Issue number4
DOIs
Publication statusPublished - 30 Apr 2014

Keywords

  • physics
  • even orders
  • five parameters
  • grover operator
  • initial conditions
  • joint moment
  • numerical evidence
  • quantum walk
  • standard deviation
  • mathematical models

Fingerprint

Dive into the research topics of 'Nonreversal and nonrepeating quantum walks'. Together they form a unique fingerprint.

Cite this