Unified Collision Model of Coherent and Measurement-based Quantum
Feedback
- URL: http://arxiv.org/abs/2204.00479v1
- Date: Fri, 1 Apr 2022 14:35:38 GMT
- Title: Unified Collision Model of Coherent and Measurement-based Quantum
Feedback
- Authors: Alfred Harwood, Matteo Brunelli, Alessio Serafini
- Abstract summary: We introduce a general framework to describe on an equal footing coherent and measurement-based feedback control of quantum mechanical systems.
We apply our framework to prominent tasks in quantum control, ranging from cooling to Hamiltonian control.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: We introduce a general framework, based on collision models and discrete
CP-maps, to describe on an equal footing coherent and measurement-based
feedback control of quantum mechanical systems. We apply our framework to
prominent tasks in quantum control, ranging from cooling to Hamiltonian
control. Unlike other proposed comparisons, where coherent feedback always
proves superior, we find that either measurements or coherent manipulations of
the controller can be advantageous depending on the task at hand.
Measurement-based feedback is typically superior in cooling, whilst coherent
feedback is better at assisting quantum operations. Furthermore, we show that
both coherent and measurement-based feedback loops allow one to simulate
arbitrary Hamiltonian evolutions, and discuss their respective effectiveness in
this regard.
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