Title:Quantum Journal Club: Hybrid Quantum Circuit with a Superconducting Qubit Coupled to a Spin Ensemble
Speaker: Xiaolong Ouyang Tsinghua University
Time: 2016-11-03 16:00-2016-11-03 17:00


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.