Universal Uhrig Dynamical Decoupling for Bosonic Systems

Margret Heinze and Robert König
Phys. Rev. Lett. 123, 010501 – Published 3 July 2019
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Abstract

We construct efficient deterministic dynamical decoupling schemes protecting continuous-variable degrees of freedom. Our schemes target decoherence induced by quadratic system-bath interactions with analytic time dependence. We show how to suppress such interactions to Nth order using only N pulses. Furthermore, we show how to homogenize a 2m-mode bosonic system using only (N+1)2m+1 pulses, yielding—up to the Nth order—an effective evolution described by noninteracting harmonic oscillators with identical frequencies. The decoupled and homogenized system provides natural decoherence-free subspaces for encoding quantum information. Our schemes only require pulses which are tensor products of single-mode passive Gaussian unitaries and swap gates between pairs of modes.

  • Figure
  • Received 7 December 2018

DOI:https://doi.org/10.1103/PhysRevLett.123.010501

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & Technology

Authors & Affiliations

Margret Heinze1,2,* and Robert König1,3

  • 1Zentrum Mathematik, Technische Universität München, 85748 Garching, Germany
  • 2Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany
  • 3Institute for Advanced Study, Technische Universität München, 85748 Garching, Germany

  • *Corresponding author. margret.heinze@ma.tum.de

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Issue

Vol. 123, Iss. 1 — 3 July 2019

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