Swift heat transfer by fast-forward driving in open quantum systems

Abstract

Typically, time-dependent thermodynamic protocols need to run asymptotically slowly in order to avoid dissipative losses. By adapting ideas from counter-diabatic driving and Floquet engineering to open systems, we develop fast-forward protocols for swiftly thermalizing a system oscillator locally coupled to an optical phonon bath. These protocols control the system frequency and the systembath coupling to induce a resonant state exchange between the system and the bath. We apply the fast-forward protocols to realize a fast approximate Otto engine operating at high power near the Carnot Efficiency. Our results suggest design principles for swift cooling protocols in coupled many-body systems. arXiv:1902.05964v1 [quant-ph]

Integrability and dark states in an anisotropic central spin model

“…Introduction. With the advent of new quantum technologies, there is increasing interest in using small quantum systems to control and coherently manipulate mesoscopic environments [1][2][3][4][5][6]. In the simplest setting, a single spin- 1 2 qubit controls a surrounding bath of spins, extending the available degrees of freedom and turning the detrimental effects of the bath into a useful resource.…”

Speeding up a quantum refrigerator via counterdiabatic driving

“…From a practical point of view, this setup is relevant for realistic experiments where the system undergoes a continuous periodic cycle with some external drives under the influence of environments. From a fundamental point of view, this setup allows one to better understand how CD could be effective in open system dynamics, which has not been explored intensively [39][40][41].…”

Shortcuts to Adiabaticity in Driven Open Quantum Systems: Balanced Gain and Loss and Non-Markovian Evolution

“…More recently, the fast thermalization of a harmonic oscillator has been proposed via the reverse engineering of a non-adiabatic Markovian master equation [43] and engineered dephasing [44]. A related study has shown the possibility of speeding up the thermalization of a system oscillator locally coupled to a harmonic bath [45]. Engineering of the system-bath coupling has also been proposed to speed-up isothermal processes [46].…”