Yuimaru Kubo: Hybrid quantum circuit with a superconducting qubit coupled to a spin ensemble

Abstract

We report the experimental realization of a hybrid quantum circuit combining a superconducting qubit and an ensemble of electronic spins.

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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[1,2].

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[3]. These results constitute a first proof of concept of spin-ensemble based quantum memory for superconducting qubits.

[1] Y. Kubo et al., Phys. Rev. Lett. 105, 140502 (2010).
[2] Y. Kubo et al., Phys. Rev. A 85, 012333 (2012).
[3] Y. Kubo et al., Phys. Rev. Lett. 107, 220501 (2011).