Resetting of a superconducting qubit: an optimal control approach.

Cosco F., Basilewitsch D., Lo Gullo N., Maniscalco S., Koch C.P.

Relazione su invito
II - Fisica della materia
Aula 32B-2 - Lunedì 17 h 16:00 - 19:00
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We study the possibility of employing optimal control strategies for a fast reset of a superconducting qubit in a dissipative environment. In NJP Quantum Information 3, 27 (2017) the authors report a protocol for the reset of a superconducting qubit coupled to an external harmonic oscillator which can be externally accessible therefore allowing for a tuning of the properties of the qubit but which on the other hand unavoidably introduces dissipation in the system. Inspired by this work and envisaging a possible experimental realization of such a setup, we look at this system applying optimal control techniques in order to find the optimal time-dependent field to be applied to obtain the highest fidelity with the wanted state and the shortest possible time. In my talk I will present such results, showing the advantage and disadvantages of such an approach. In the end I will also discuss the possibility to apply reinforcement learning to such a problem which would solve some of the drawbacks arising from the optimal control techniques.

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