Hybrid quantum circuit with a superconducting qubit coupled to a spin ensemble

Details Hybrid quantum circuit with a superconducting qubit coupled to a spin ensemble Hybrid quantum circuit with a superconducting qubit coupled to a spin ensemble

2011-10-13

arxiv.org/abs/1110.2978v1

Phys. Rev. Lett. 107, 220501 (2011)

Physics

Quantum Physics

13 pages, 4 figures, plus supplementary information

Scientific paper

10.1103/PhysRevLett.107.220501

We report the experimental realization of a hybrid quantum circuit combining a superconducting qubit and an ensemble of electronic spins. The qubit, of the transmon type, is coherently coupled to the spin ensemble consisting of nitrogen-vacancy (NV) centers in a diamond crystal via a frequency-tunable superconducting resonator acting as a quantum bus. Using this circuit, we prepare arbitrary superpositions of the qubit states that we store into collective excitations of the spin ensemble and retrieve back later on into the qubit. These results constitute a first proof of concept of spin-ensemble based quantum memory for superconducting qubits.

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