Dear all
Please be informed about the following joint Solid State Physics/QSIT Seminar.
With best regards, Ilona Blatter --------------------------------------------------- Date: Thursday March 29, 2012 Time: 14:00 Place: ETH Science City, HPF G 6 Host: Andreas Wallraff
Hybrid quantum circuit with a superconducting qubit coupled to a spin ensemble Denis Vion CEA-Saclay, Gif-sur-Yvette Cedex (France)
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 [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] with a fidelity of about 10%. These results constitute a 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)
--------------------------------------------------- ETH Zurich Dr. Ilona Blatter NCCR QSIT Coordinator Laboratory for Solid State Physics HPF E 17 Schafmattstrasse 16 8093 Zurich
ilona.blatter@phys.ethz.ch www.nccr-qsit.ethz.ch
Phone: +41 44 633 36 06