Universal quantum computation in decoherence-free subspaces with hot trapped ions

Leandro Aolita, Luiz Davidovich, Kihwan Kim, and Hartmut Häffner

Phys. Rev. A 75, 052337 – Published 31 May 2007

Abstract

We consider interactions that generate a universal set of quantum gates on logical qubits encoded in a collective-dephasing-free subspace, and discuss their implementations with trapped ions. This allows for the removal of the by-far largest source of decoherence in current trapped-ion experiments, collective dephasing. In addition, an explicit parametrization of all two-body Hamiltonians able to generate such gates without the system’s state ever exiting the protected subspace is provided.

Received 22 March 2006

DOI:https://doi.org/10.1103/PhysRevA.75.052337

Authors & Affiliations

Leandro Aolita^1,2, Luiz Davidovich¹, Kihwan Kim³, and Hartmut Häffner⁴

¹Instituto de Física, Universidade Federal do Rio de Janeiro, Caixa Postal 68528, 21941-972 Rio de Janeiro, Rio de Janeiro, Brazil
²Max-Planck-Institute für Physic Komplexer Systeme, Nöthnitzerstrasse 38, D-01187, Dresden, Germany
³Institut für Experimentalphysik, Universität Innsbruck, Technikerstraße 25, A-6020 Innsbruck, Austria
⁴Institut für Quantenoptik und Quanteninformation der Österreichischen, Akademie der Wissenschaften, Technikerstraße 21a, A-6020 Innsbruck, Austria

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Issue

Vol. 75, Iss. 5 — May 2007

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