Nonadiabatic control of quantum transport fidelity in dissipative cold
media
- URL: http://arxiv.org/abs/2109.13647v1
- Date: Tue, 28 Sep 2021 12:10:05 GMT
- Title: Nonadiabatic control of quantum transport fidelity in dissipative cold
media
- Authors: Arnab Chakrabarti, Igor Mazets, Tian-Niu Xu, Xi Chen and Gershon
Kurizki
- Abstract summary: We put forth a hitherto unexplored control strategy that enables finite-speed, high-fidelity transport of a quantum wavepacket through a dissipative medium.
A relevant scenario is a quantum impurity moving through an ultracold gas.
Unlike shortcuts to adiabaticity, our approach can simultaneously cope with wavepacket leakage via non-adiabatic and phonon-mediated processes.
- Score: 3.53163169498295
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We put forth a hitherto unexplored control strategy that enables
finite-speed, high-fidelity transport of a quantum wavepacket through a
low-temperature dissipative medium. The control consists in confining the
wavepacket within a shallow anharmonic trap (tweezer), whose nonuniform
velocity is steered so as to maximize the transfer fidelity between two
locations. A relevant scenario is a quantum impurity moving through an
ultracold gas. Unlike shortcuts to adiabaticity, our approach can
simultaneously cope with wavepacket leakage via non-adiabatic and
phonon-mediated processes, provided both act perturbatively. Nor does our
approach require the application of compensating forces or counter-diabatic
fields and thereby avoids the practical shortcomings of shortcut techniques.
Instead, optimal (highest fidelity) transport is achieved here by minimizing
the functional overlap of the varying velocity-spectrum of the chosen
trajectory with the combined (bath-induced and non-adiabatic) leakage spectrum.
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