Overview

This work describes theoretical and experimental advances towards the realization of a hybrid quantum processor in which the collective degrees of freedom of an ensemble of spins in a crystal are used as a multi-qubit register for superconducting qubits. A memory protocol made of write, read and reset operations is first presented, followed by the demonstration of building blocks of its implementation with NV center spins in diamond. Qubit states are written by resonant absorption of a microwave photon in the spin ensemble and read out of the memory on-demand by applying Hahn echo refocusing techniques to the spins. The reset step is implemented in between two successive write-read sequences using optical repumping of the spins.

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9783319370705

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Cécile Grèzes received the B.S. degree from the Ecole Normale supérieure, Paris, France, in 2009 and her Ph.D. from the University Paris VI in 2014. Her thesis work was performed at the Commissariat à l’énergie atomique on experimental quantum information processing with Josephson superconducting circuits and spins in crystal. Since 2015, she has been working on the development of nonvolatile magnetic memory in the electrical engineering department at the University of California Los Angeles.

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