Home › 10. QUANTUM COMPUTATION › 16. IMPLEMENTATIONS: CONDENSED MATTER

16.20.Cq Charge qubits

Steady-state entanglement of two superconducting qubits engineered by dissipation

Thu, 2014-01-16 18:00 - Sumanta Das
Date: 
2013-09-16 - 2014-01-16
Author(s): 

Florentin Reiter,
L. Tornberg,
Göran Johansson,
Anders S. Sørensen

Reference: 

PHYSICAL REVIEW A 88, 032317 (2013)

URL: 

http://link.aps.org/doi/10.1103/PhysRevA.88.032317

We present a scheme for the dissipative preparation of an entangled steady state of two superconducting qubits in a circuit quantum electrodynamics (QED) setup. Combining resonator photon loss—a dissipative process already present in the setup—with an effective two-photon microwave drive, we engineer an effective decay mechanism which prepares a maximally entangled state of the two qubits. This state is then maintained as the steady state of the driven, dissipative evolution.

Hybrid Quantum Circuit with a Superconducting Qubit Coupled to a Spin Ensemble

Tue, 2012-03-20 12:27 - Lukas Hanschke
Date: 
2011-11-21 - 2012-03-20
Author(s): 

Y. Kubo, C. Grezes, A. Dewes, T. Umeda, J. Isoya, H. Sumiya, N. Morishita, H. Abe, S. Onoda, T. Ohshima, V. Jacques, A. Dréau, J.-F. Roch, I. Diniz, A. Auffeves, D. Vion, D. Esteve, and P. Bertet

Reference: 

Phys. Rev. Lett. 107, 220501

URL: 

http://prl.aps.org/abstract/PRL/v107/i22/e220501

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.

Syndicate content