Work

Decoherence in a dynamical quantum phase transition

Year: 2010

Type: article

Abstract: Motivated by the similarity between adiabatic quantum algorithms and quantum phase transitions, we study the impact of decoherence on the sweep through a second-order quantum phase transition for the prototypical example of the Ising chain in a transverse field and compare it to the adiabatic version of Grover's search algorithm, which displays a first-order quantum phase transition. For site-independent and site-dependent coupling strengths as well as different operator couplings, the results show (in contrast to first-order transitions) that the impact of decoherence caused by a weak coupling to a rather general environment increases with system size (i.e., number of spins or qubits). This might limit the scalability of the corresponding adiabatic quantum algorithm.

Source: Physical Review A

DOI: 10.1103/physreva.81.032305

Authors: Sarah Mostame, Gernot Schaller, Ralf Schützhold

Institutions: Max Planck Institute for the Physics of Complex Systems, Technische Universität Dresden, Technische Universität Berlin, University of Duisburg-Essen

Language: English

Topic: Quantum Computing Algorithms and Architecture

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: green

OpenAlex ID: W2093631199

FWCI: 0.34

Cites: 39

Cited by: 8

Related to: 10