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arXiv:1802.01420 · Physical Review A

Experimental realization of noise-induced adiabaticity in nuclear magnetic resonance

Bi-Xue Wang, Tao Xin, Xiangyu Kong, Shi-Jie Wei, Dong Ruan, Gui‐Lu Long

Published Apr 27, 2018• 14 citations
arXivHTMLPDF

Abstract

The adiabatic evolution is the dynamics of an instantaneous eigenstate of a slowly varing Hamiltonian. Recently, an interesting phenomenon shows up that white noises can enhance and even induce adiabaticity, which is in contrast to previous perception that environmental noises always modify and even ruin a designed adiabatic passage. We experimentally realized a noise-induced adiabaticity in a nuclear magnetic resonance system. Adiabatic Hadamard gate and entangled state are demonstrated. The effect of noise on adiabaticity is experimentally exhibited and compared with the noise-free process. We utilized a noise-injected method, which can be applied to other quantum systems.

DOI
10.1103/physreva.97.042345

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The adiabatic evolution is the dynamics of an instantaneous eigenstate of a slowly varing Hamiltonian. Recently, an interesting phenomenon shows up that white noises can enhance and even induce adiabaticity, which is in contrast to previous perception that environmental noises always modify and even ruin a designed adiabatic passage. We experimentally realized a noise-induced adiabaticity in a nuclear magnetic resonance system. Adiabatic Hadamard gate and entangled state are demonstrated. The effect of noise on adiabaticity is experimentally exhibited and compared with the noise-free process. We utilized a noise-injected method, which can be applied to other quantum systems.
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Quantum adiabatic algorithms is a method of solving computational problems by evolving the ground state of a slowly varying Hamiltonian. The technique uses evolution of the ground state of a slowly varying Hamiltonian to reach the required output state. The adiabatic Deutsch-Jozsa algorithm given be Saurya Das, Randy Kobes and Gabor Kunstatter [Phys. Rev. A. 65, 062301 (2002)], shows how the Deutsch-Jozsa algorithm can be implemented in N^{1/2} steps, where N=2^n and n is the number of qubits, using local adiabatic evolution. In this paper we report the experimental implementation of the adiabatic Deutsch-Jozsa algorithm in a two qubit quantum information processor by Nuclear Magnetic Resonance.
We present a study of adiabaticity in Nuclear Magnetic Resonance.First, we present a review on the concept of adiabaticity in closed and open quantum systems.Many commonly used adiabatic processes in Magnetic Resonance perform well even though the adiabatic approximation does not appear to hold throughout the process, then through the use Berry's superadiabatic formalism make corrections to the pulse satisfies the adiabatic condition.This approach, a but time-dependent Hamiltonian slowly evolving is iteratively transformed into time-dependent diagonal frames until the most accurate adiabatic approximation is obtained.Examine the capabilities of superadiabatics iterations to produce a shortcut sequence to adiabaticity system and extend the concept of dynamic superadiabatic for open systems, whose evolution is governed by a master equation of Lindblad form, providing the necessary framework to determine the strategy control needed to achieve superadibaticity.
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