LTC Seminar LTClogoMedKat3 Title: Hybrid quantum circuit with a superconducting qubit coupled to a spin ensemble Speaker: Patrice Bertet, CEA, Saclay, France Time: Tuesday, January 31, 2012 at 15:15 Place: 1520-732 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 via a frequency-tunable superconducting resonator to the spin ensemble which consists of nitrogen-vacancy (NV) centers in a diamond crystal [1]. Using this circuit, we prepare arbitrary superpositions of the qubit states that we store into collective excitations of the spin ensemble and retrieve back into the qubit [2]. These results constitute a first proof of concept of a 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. Lett. 107, 220501 (2011). Klaus Mølmer Coffee/tea and cake from 15:00
