Adiabatic information transport in the presence of decoherence

Abstract

We study adiabatic population transfer between discrete positions. Being closely related to STIRAP in optical systems, this transport is coherent and robust against variations of experimental parameters. Thanks to these properties the scheme is a promising candidate for transport of quantum information in quantum computing. We study the effects of spatially registered noise sources on the quantum transport and in particular model Markovian decoherence via non-local coupling to nearby quantum point contacts which serve as information readouts. We find that the rate of decoherence experienced by a spatial superposition initially grows with spatial separation but surprisingly then plateaus. In addition we include non-Markovian effects due to couplings to nearby two level systems and we find that although the population transport exhibits robustness in the presence of both types of noise sources, the transport of a spatial superposition exhibits severe fragility.

11pages

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• Atoms versus photons as carriers of quantum states
• Coherent transfer by adiabatic passage in two-dimensional lattices
• Long-range coupling of silicon photonic waveguides using lateral leakage and adiabatic passage
• Measurement back-action on adiabatic coherent electron transport
• Influence of two-level fluctuators on adiabatic passage techniques
• Long-range adiabatic quantum state transfer through a tight-binding chain as a quantum data bus
• Coherent Cooper-pair pumping by magnetic flux control