title: 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. The qubit, of the transmon type, is coherently coupled to the spin ensemble consisting of nitrogen-vacancy centers in a diamond crystal via a frequency-tunable superconducting resonator acting as a quantum bus. Using this circuit, we prepare a superposition of the qubit states that we store into collective excitations of the spin ensemble and retrieve back into the qubit later on. These results constitute a proof of concept of spin-ensemble based quantum memory for superconducting qubits.
authors.affiliation: Quantronics group, SPEC (CNRS URA 2464), IRAMIS, DSM, CEA-Saclay, 91191 Gif-sur-Yvette, France.
authors.forename: Y
authors.initials: Y
authors.lastname: Kubo
authors.forename: C
authors.initials: C
authors.lastname: Grezes
authors.forename: A
authors.initials: A
authors.lastname: Dewes
authors.forename: T
authors.initials: T
authors.lastname: Umeda
authors.forename: J
authors.initials: J
authors.lastname: Isoya
authors.forename: H
authors.initials: H
authors.lastname: Sumiya
authors.forename: N
authors.initials: N
authors.lastname: Morishita
authors.forename: H
authors.initials: H
authors.lastname: Abe
authors.forename: S
authors.initials: S
authors.lastname: Onoda
authors.forename: T
authors.initials: T
authors.lastname: Ohshima
authors.forename: V
authors.initials: V
authors.lastname: Jacques
authors.forename: A
authors.initials: A
authors.lastname: Dréau
authors.forename: J-F
authors.initials: JF
authors.lastname: Roch
authors.forename: I
authors.initials: I
authors.lastname: Diniz
authors.forename: A
authors.initials: A
authors.lastname: Auffeves
authors.forename: D
authors.initials: D
authors.lastname: Vion
authors.forename: D
authors.initials: D
authors.lastname: Esteve
authors.forename: P
authors.initials: P
authors.lastname: Bertet