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Shortcut to Equilibration of an Open Quantum System
Roie Dann1,2, Ander Tobalina2,3, Ronnie Kosloff1,2
1The Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel.
Physical Review Letters
|July 27, 2019
Summary
We developed a shortcut to equilibration protocol to rapidly accelerate open quantum system relaxation. This method significantly enhances accuracy for controlling quantum system entropy and Hamiltonian changes.
Area of Science:
- Quantum physics
- Statistical mechanics
- Quantum information
Background:
- Open quantum systems naturally relax to equilibrium.
- Controlling quantum system dynamics is crucial for quantum technologies.
- Rapidly changing system parameters (quenches) can be challenging to manage precisely.
Purpose of the Study:
- To present a novel procedure for accelerating the relaxation of open quantum systems.
- To introduce a control protocol, the shortcut to equilibration, for rapid entropy change.
- To demonstrate the protocol's effectiveness in simulating a quantum quench.
Main Methods:
- Reverse-engineering the non-adiabatic master equation to derive the control protocol.
- Implementing a non-unitary control task to manipulate system entropy.
- Applying the protocol to study the thermalization of a particle in a harmonic well.
Main Results:
- The shortcut to equilibration protocol effectively accelerates system relaxation towards equilibrium.
- The protocol allows for rapid and controlled changes in system entropy.
- Accuracy of the process improved by three orders of magnitude for short protocols.
Conclusions:
- The shortcut to equilibration offers an efficient method for controlling open quantum systems.
- This technique provides a pathway for rapid Hamiltonian changes (quenches) with high fidelity.
- The findings have implications for quantum simulations and quantum information processing.
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