Issue 18, 2018

Optimal control of orientation and entanglement for two dipole–dipole coupled quantum planar rotors

Abstract

Optimal control simulations are performed for orientation and entanglement of two dipole–dipole coupled identical quantum rotors. The rotors at various fixed separations lie on a model non-interacting plane with an applied control field. It is shown that optimal control of orientation or entanglement represents two contrasting control scenarios. In particular, the maximally oriented state (MOS) of the two rotors has a zero entanglement entropy and is readily attainable at all rotor separations. Whereas, the contrasting maximally entangled state (MES) has a zero orientation expectation value and is most conveniently attainable at small separations where the dipole–dipole coupling is strong. It is demonstrated that the peak orientation expectation value attained by the MOS at large separations exhibits a long time revival pattern due to the small energy splittings arising form the extremely weak dipole–dipole coupling between the degenerate product states of the two free rotors. Moreover, it is found that the peak entanglement entropy value attained by the MES remains largely unchanged as the two rotors are transported to large separations after turning off the control field. Finally, optimal control simulations of transition dynamics between the MOS and the MES reveal the intricate interplay between orientation and entanglement.

Graphical abstract: Optimal control of orientation and entanglement for two dipole–dipole coupled quantum planar rotors

Article information

Article type
Paper
Submitted
11 Jan 2018
Accepted
23 Apr 2018
First published
23 Apr 2018

Phys. Chem. Chem. Phys., 2018,20, 13008-13029

Author version available

Optimal control of orientation and entanglement for two dipole–dipole coupled quantum planar rotors

H. Yu, T. Ho and H. Rabitz, Phys. Chem. Chem. Phys., 2018, 20, 13008 DOI: 10.1039/C8CP00231B

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