Malinovsky, Vladimir S. and Sola, Ignacio R. and Vala, Jiri (2014) Phase-controlled two-qubit quantum gates. Physical Review A, 89 (032301). ISSN 1050-2947

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Abstract

We consider an implementation of a two-qubit entangling gate between trapped ions controlled by fully overlapping laser pulses. We particularly address the role of a relative phase between the pulses in the gate design. Though, in general, the relative phase determines the exact form of the two-qubit operation, it is shown that it affects only its single qubit part and has no effect on its entangling content. Based on a general canonical decomposition of the evolution operator we demonstrate that the controlled-NOT (CNOT) gate can be decomposed in terms of a two-qubit entangled gate and single qubit phase gates. Our study shows that any relative phase errors in two-qubit operations related to phase fluctuations of the external fields can be successfully corrected locally by single-qubit operations, which are usually easy to implement.

Item Type:	Article
Keywords:	Phase-controlled; two-qubit; quantum gates;
Academic Unit:	Faculty of Science and Engineering > Mathematical Physics
Item ID:	5479
Identification Number:	https://doi.org/10.1103/PhysRevA.89.032301
Depositing User:	Dr. Jiri Vala
Date Deposited:	13 Oct 2014 11:02
Journal or Publication Title:	Physical Review A
Publisher:	American Physical Society
Refereed:	Yes
URI:	Publisher

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