28 citations · 153 across the 14 of their papers we have counts for
14 papers
Quantitative characterization of several entanglement detection criteria
A. Sauer, J. Z. Bernád
Quantitative characterization of different entanglement detection criteria for bipartite systems is presented. We review the implication sequence of these criteria and then numeric…
Optimal two-qubit gates in recurrence protocols of entanglement purification
Francesco Preti, Tommaso Calarco, Juan Mauricio Torres +1
We propose and investigate a method to optimize recurrence entanglement purification protocols. The approach is based on a numerical search in the whole set of SU(4) matrices with…
Estimation of disorders in the rest positions of two membranes in optomechanical systems
Claudio Sanavio, József Zsolt Bernád, André Xuereb
The formalism of quantum estimation theory is applied to estimate the disorders in the positions of two membranes positioned in a driven cavity. We consider the coupled-cavities an…
Range of applicability of the Hu-Paz-Zhang master equation
G. Homa, A. Csordás, M. A. Csirik +1
We investigate a case of the Hu-Paz-Zhang master equation of the Caldeira-Leggett model without Lindblad form obtained in the weak-coupling limit up to the second-order perturbatio…
Fisher-information-based estimation of optomechanical coupling strengths
Claudio Sanavio, József Zsolt Bernád, André Xuereb
The formalism of quantum estimation theory, focusing on the quantum and classical Fisher information, is applied to the estimation of the coupling strength in an optomechanical sys…
Product formulas in the framework of mean ergodic theorems
J. Z. Bernád
An extension of Chernoff's product formula for one-parameter functions taking values in the space of bounded linear operators on a Banach space is given. Essentially, the -th on…
Optimal estimation of matter-field coupling strength in the dipole approximation
József Zsolt Bernád, Claudio Sanavio, André Xuereb
This paper is devoted to the study of the Bayesian-inference approach in the context of estimating the dipole coupling strength in matter-field interactions. In particular, we cons…
Optimal estimation of the optomechanical coupling strength
József Zsolt Bernád, Claudio Sanavio, André Xuereb
We apply the formalism of quantum estimation theory to obtain information about the value of the nonlinear optomechanical coupling strength. In particular, we discuss the minimum m…
On the limit relation for the quantum relative entropy
J. Z. Bernád, A. B. Frigyik
Recently, Diósi et al. (Int. J. Quant. Inf. 4, 99 (2006)) introduced a simple, yet very interesting model for reservoirs, in order to study the relationship between thermodynamic e…
Measurement-induced chaos and quantum state discrimination in an iterated Tavis-Cummings scheme
Juan Mauricio Torres, József Zsolt Bernád, Gernot Alber +2
A cavity quantum electrodynamical scenario is proposed for implementing a Schrödinger microscope capable of amplifying differences between non orthogonal atomic quantum states. The…
Conditions for entanglement purification with general two-qubit states
Juan Mauricio Torres, József Zsolt Bernád
We present the convergence study of a recurrence entanglement purification protocol using arbitrary two-qubit initial states. The protocol is based on a rank two projector in the B…
Multiphoton-state-assisted entanglement purification of material qubits
József Zsolt Bernád, Juan Mauricio Torres, Ludwig Kunz +1
We propose an entanglement purification scheme based on material qubits and ancillary coherent multiphoton states. We consider a typical QED scenario where material qubits implemen…
Partly invariant steady state of two interacting open quantum systems
József Zsolt Bernád, Juan Mauricio Torres
We investigate two interacting open quantum systems whose time evolutions are governed by Markovian master equations. We show a class of coupled systems whose interaction leaves in…
Quantum teleportation and entanglement swapping of matter qubits with coherent multiphoton states
J. M. Torres, J. Z. Bernád, G. Alber
Protocols for probabilistic entanglement-assisted quantum teleportation and for entanglement swapping of material qubits are presented. They are based on a protocol for postselecti…