Decoherence in a scalable adiabatic quantum computer

Journal Article · Wed Nov 15 00:00:00 EST 2006 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.74.052330· OSTI ID:20974721

Ashhab, S; Johansson, J R ^[1]; Nori, Franco ^[1]

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1. Frontier Research System, Institute of Physical and Chemical Research (RIKEN), Wako-shi, Saitama (Japan)

We consider the effects of decoherence on Landau-Zener crossings encountered in a large-scale adiabatic-quantum-computing setup. We analyze the dependence of the success probability--i.e., the probability for the system to end up in its new ground state--on the noise amplitude and correlation time. We determine the optimal sweep rate that is required to maximize the success probability. We then discuss the scaling of decoherence effects with increasing system size. We find that those effects can be important for large systems, even if they are small for each of the small building blocks.

• OSTI ID: 20974721
• Journal Information: Physical Review. A, Vol. 74, Issue 5; Other Information: DOI: 10.1103/PhysRevA.74.052330; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ADIABATIC PROCESSES
AMPLITUDES
CORRELATIONS
GROUND STATES
LANDAU-ZENER FORMULA
NOISE
PROBABILITY
QUANTUM COMPUTERS
QUANTUM DECOHERENCE
QUANTUM MECHANICS
SCALING