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Zeno physics in ultrastrong-coupling circuit QED

Mon, 2011-02-14 20:15 - Daniel Rudolph
Date: 
2010-06-30
Author(s): 

I. Lizuain, J. Casanova, J. J. García-Ripoll, J. G. Muga, and E. Solano

Reference: 

Phys. Rev. A 81, 062131 (2010)

URL: 

http://link.aps.org/doi/10.1103/PhysRevA.81.062131

We study the Zeno and anti-Zeno effects in a superconducting qubit interacting strongly and ultrastrongly with a microwave resonator. Using a model of a frequently measured two-level system interacting with a quantized mode, we predict different behaviors and total control of the Zeno times depending on whether the rotating-wave approximation can be applied in the Jaynes-Cummings model. As an example, we show the dependence of our results with the properties of the initial field states.

 

Switchable Ultrastrong Coupling in Circuit QED

Mon, 2011-02-14 20:13 - Daniel Rudolph
Date: 
2010-07-06
Author(s): 

B. Peropadre, P. Forn-Díaz, J. J. García-Ripoll, and E. Solano

Reference: 

Phys. Rev. Lett. 105, 023601 (2010)

URL: 

http://link.aps.org/doi/10.1103/PhysRevLett.105.023601

We propose different designs of switchable coupling between a superconducting flux qubit and a microwave transmission line. They are based on two or more loops of Josephson junctions which are directly connected to a closed (cavity) or open transmission line. In both cases the circuit induces a coupling that can be modulated in strength, reaching the so-called ultrastrong coupling regime in which the coupling is comparable to the qubit and photon frequencies. Furthermore, we suggest a wide set of applications for the introduced architectures.

Short-time-interaction quantum measurement through an incoherent mediator

Mon, 2011-02-14 20:12 - Daniel Rudolph
Date: 
2010-06-24
Author(s): 

J. Casanova, G. Romero, I. Lizuain, J. C. Retamal, C. Roos, J. G. Muga, and E. Solano

Reference: 

Phys. Rev. A 81, 062126 (2010)

URL: 

http://link.aps.org/doi/10.1103/PhysRevA.81.062126

Resonant quantum gates in circuit quantum electrodynamics

Mon, 2011-02-14 20:10 - Daniel Rudolph
Date: 
2010-07-20
Author(s): 

G. Haack, F. Helmer, M. Mariantoni, F. Marquardt, and E. Solano

Reference: 

Phys. Rev. B 82, 024514 (2010)

URL: 

http://link.aps.org/doi/10.1103/PhysRevB.82.024514

Entanglement equivalence of N-qubit symmetric states

Mon, 2011-02-14 20:09 - Daniel Rudolph
Date: 
2010-05-14
Author(s): 

P. Mathonet, S. Krins, M. Godefroid, L. Lamata, E. Solano, and T. Bastin

Reference: 

Phys. Rev. A 81, 052315 (2010)

URL: 

http://link.aps.org/doi/10.1103/PhysRevA.81.052315

Dynamics of entanglement via propagating microwave photons

Mon, 2011-02-14 20:07 - Daniel Rudolph
Date: 
2010-05-04
Author(s): 

C. Sabín, J. J. García-Ripoll, E. Solano, and J. León

Reference: 

Phys. Rev. B 81, 184501 (2010)

URL: 

http://link.aps.org/doi/10.1103/PhysRevB.81.184501

Two-resonator circuit quantum electrodynamics: Dissipative theory

Mon, 2011-02-14 20:03 - Daniel Rudolph
Date: 
2010-04-20
Author(s): 

G. M. Reuther, D. Zueco, F. Deppe, E. Hoffmann, E. P. Menzel, T. Weißl, M. Mariantoni, S. Kohler,
A. Marx, E. Solano, R. Gross, P. Hänggi

Reference: 

Phys. Rev. B 81, 144510 (2010)

URL: 

http://link.aps.org/doi/10.1103/PhysRevB.81.144510

Mesoscopic shelving readout of superconducting qubits in circuit quantum electrodynamics

Mon, 2011-02-14 20:00 - Daniel Rudolph
Date: 
2010-04-14
Author(s): 

B. G. U. Englert, G. Mangano, M. Mariantoni, R. Gross, J. Siewert, and E. Solano

Reference: 

Phys. Rev. B 81, 134514 (2010)

URL: 

http://link.aps.org/doi/10.1103/PhysRevB.81.134514

Operational multipartite entanglement classes for symmetric photonic qubit states

Mon, 2011-02-14 19:56 - Daniel Rudolph
Date: 
2010-03-17
Author(s): 

N. Kiesel, W. Wieczorek, S. Krins, T. Bastin, H. Weinfurter, and E. Solano

Reference: 

Phys. Rev. A 81, 032316 (2010)

URL: 

http://link.aps.org/doi/10.1103/PhysRevA.81.032316

We present experimental schemes that allow us to study the entanglement classes of all symmetric states in multiqubit photonic systems. We compare the efficiency of the proposed schemes and highlight the relation between the entanglement properties of symmetric Dicke states and a recently proposed entanglement scheme for atoms. In analogy to the latter, we obtain a one-to-one correspondence between well-defined sets of experimental parameters and multiqubit entanglement classes inside the symmetric subspace of the photonic system.

Realization of a Quantum Walk with One and Two Trapped Ions

Mon, 2011-02-14 19:55 - Daniel Rudolph
Date: 
2010-03-09
Author(s): 

F. Zähringer, G. Kirchmair, R. Gerritsma, E. Solano, R. Blatt, and C. F. Roos

Reference: 

Phys. Rev. Lett. 104, 100503 (2010)

URL: 

http://link.aps.org/doi/10.1103/PhysRevLett.104.100503

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