Authors
AT Rezakhani, AK Pimachev, DA Lidar
Publication date
2010/11
Journal
Physical Review A—Atomic, Molecular, and Optical Physics
Volume
82
Issue
5
Pages
052305
Publisher
American Physical Society
Description
Adiabatic quantum algorithms are characterized by their run time and accuracy. The relation between the two is essential for quantifying adiabatic algorithmic performance yet is often poorly understood. We study the dynamics of a continuous time, adiabatic quantum search algorithm and find rigorous results relating the accuracy and the run time. Proceeding with estimates, we show that under fairly general circumstances the adiabatic algorithmic error exhibits a behavior with two discernible regimes: The error decreases exponentially for short times and then decreases polynomially for longer times. We show that the well-known quadratic speedup over classical search is associated only with the exponential error regime. We illustrate the results through examples of evolution paths derived by minimization of the adiabatic error. We also discuss specific strategies for controlling the adiabatic error and run time.
Total citations
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Scholar articles
AT Rezakhani, AK Pimachev, DA Lidar - Physical Review A—Atomic, Molecular, and Optical …, 2010