SOLID

Mutual coupling of two semiconductor quantum dots via an optical nanocavity

Date: 
2010-08-06
Author(s): 

A. Laucht, J. M. Villas-Bôas, S. Stobbe, N. Hauke, F. Hofbauer, G. Böhm, P. Lodahl, M.-C. Amann, M. Kaniber, and J. J. Finley

Reference: 

Phys. Rev. B 82, 075305 (2010)

Method for cooling nanostructures to microkelvin temperatures

Date: 
2010-10-25
Author(s): 

A. C. Clark, K. K. Schwarzwälder, T. Bandi, D. Maradan, and D. M. Zumbühl

Reference: 

Rev. Sci. Instrum. 81, 103904 (2010)

We propose a new scheme aimed at cooling nanostructures to microkelvin temperature based on the well established technique of adiabatic nuclear demagnetization: we attach each device measurement lead to an individual nuclear refrigerator, allowing efficient thermal contact to a microkelvin bath.

Detection of Qubit-Oscillator Entanglement in Nanoelectromechanical Systems

Date: 
2010-04-29
Author(s): 

Thomas L. Schmidt, Kjetil Børkje, Christoph Bruder, and Björn Trauzettel

Reference: 

Phys. Rev. Lett. 104, 177205 (2010)

One-step multiqubit Greenberger-Horne-Zeilinger state generation in a circuit QED system

Date: 
2010-03-24
Author(s): 

Ying-Dan Wang, Stefano Chesi, Daniel Loss, and Christoph Bruder

Reference: 

Phys. Rev. B 81, 104524 (2010)

We propose a one-step scheme to generate Greenberger-Horne-Zeilinger (GHZ) states for superconducting flux qubits or charge qubits in a circuit QED setup. The GHZ state can be produced within the coherence time of the multiqubit system. Our scheme is independent of the initial state of the transmission line resonator and works in the presence of higher harmonic modes. Our analysis also shows that the scheme is robust to various operation errors and environmental noise.

Free-induction decay and envelope modulations in a narrowed nuclear spin bath

Date: 
2010-04-19
Author(s): 

W. A. Coish, Jan Fischer, and Daniel Loss

Reference: 

Phys. Rev. B 81, 165315 (2010)

Weak continuous monitoring of a flux qubit using coplanar waveguide resonator

Date: 
2010-05-26
Author(s): 

G. Oelsner, S. H. W. van der Ploeg, P. Macha, U. Hübner, D. Born, S. Anders, E. Il’ichev, and H.-G. Meyer, M. Grajcar, S. Wünsch, M. Siegel, A. N. Omelyanchouk, B. Verkin, O. Astafiev

Reference: 

Phys. Rev. B 81, 172505 (2010)

We study a flux qubit in a coplanar waveguide resonator by measuring transmission through the system. In our system with the flux qubit decoupled galvanically from the resonator, the intermediate coupling regime is achieved. In this regime, dispersive readout is possible with weak back action on the qubit. The detailed theoretical analysis and simulations give good agreement with the experimental data and allow us to make the qubit characterization.

Quantitative evaluation of defect-models in superconducting phase qubits

Date: 
2010-12-20
Author(s): 

J. H. Cole, C. Müller, P. Bushev, G. J. Grabovskij, J. Lisenfeld, A. Lukashenko, A. V. Ustinov, and A. Shnirman

Reference: 

Appl. Phys. Lett. 97, 252501 (2010)

We use high-precision spectroscopy and detailed theoretical modeling to determine the form of the coupling between a superconducting phase qubit and a two-level defect. Fitting the experimental data with our theoretical model allows us to determine all relevant system parameters. We observe a strong qubit-defect coupling with a nearly vanishing longitudinal component. We quantitatively compare several existing theoretical models for the microscopic origin of two-level defects.

 

Measuring the Temperature Dependence of Individual Two-Level Systems by Direct Coherent Control

Date: 
2010-12-03
Author(s): 

J. Lisenfeld, C. Müller, J. H. Cole, P. Bushev, A. Lukashenko, A. Shnirman, and A. V. Ustinov

Reference: 

Phys. Rev. Lett. 105, 230504 (2010)

Multiphoton spectroscopy of a hybrid quantum system

Date: 
2010-10-25
Author(s): 

P. Bushev, C. Müller, J. Lisenfeld, J. H. Cole, A. Lukashenko, A. Shnirman, and A. V. Ustinov

Reference: 

Phys. Rev. B 82, 134530 (2010)

Syndicate content