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01.30.+r Quantum states and dynamics as a resource for information processing

Solvable model of dissipative dynamics in the deep strong coupling regime

Wed, 2012-03-07 17:27 - Enrique Solano
Date: 
2012-03-07
Author(s): 

M. Bina, G. Romero, J. Casanova, J. J. García-Ripoll, A. Lulli, F. Casagrande, and E. Solano

Reference: 

Eur. Phys. J. Special Topics 203, 207 (2012)

URL: 

http://arxiv.org/abs/1107.3398

We describe the dynamics of a qubit interacting with a bosonic mode coupled to a zero-temperature bath in the deep strong coupling (DSC) regime. We provide an analytical solution for this open system dynamics in the off-resonance case of the qubit-mode interaction. Collapses and revivals of parity chain populations and the oscillatory behavior of the mean photon number are predicted. At the same time, photon number wave packets, propagating back and forth along parity chains, become incoherently mixed.

Entanglement Storage Units

Tue, 2011-09-06 15:37 - Negretti Antonio
Date: 
2011-08-16
Author(s): 

T. Caneva, T. Calarco, S. Montangero

Reference: 

New J. Phys. 14 093041 (2012)

URL: 

http://lanl.arxiv.org/abs/1108.3200

We introduce a protocol to drive many body quantum systems into long-lived entangled states, protected from decoherence by big energy gaps. With this approach it is possible to implement scalable entanglement-storage units. We test the protocol in the Lipkin-Meshkov-Glick model, a prototype many-body quantum system that describes different experimental setups.

Bound Nonlocality and Activation

Mon, 2011-02-14 16:09 - Q-Essence Coordinator
Date: 
2011-01-10
Author(s): 

Nicolas Brunner, Daniel Cavalcanti, Alejo Salles, and Paul Skrzypczyk

Reference: 

Phys. Rev. Lett. 106, 020402 (2011)

URL: 

http://link.aps.org/doi/10.1103/PhysRevLett.106.020402

We investigate nonlocality distillation using measures of nonlocality based on the Elitzur-Popescu-Rohrlich decomposition. For a certain number of copies of a given nonlocal box, we define two quantities of interest: (i) the nonlocal cost and (ii) the distillable nonlocality. We find that there exist boxes whose distillable nonlocality is strictly smaller than their nonlocal cost. Thus nonlocality displays a form of irreversibility which we term “bound nonlocality.” Finally, we show that nonlocal distillability can be activated.

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