Improving the entanglement transfer from continuous variable systems to localized qubits using non Gaussian states

Abstract

We investigate the entanglement transfer from a bipartite continuous-variable (CV) system to a pair of localized qubits assuming that each CV mode couples to one qubit via the off-resonance Jaynes-Cummings interaction with different interaction times for the two subsystems. First, we consider the case of the CV system prepared in a Bell-like superposition and investigate the conditions for maximum entanglement transfer. Then we analyze the general case of two-mode CV states that can be represented by a Schmidt decomposition in the Fock number basis. This class includes both Gaussian and non Gaussian CV states, as for example twin-beam (TWB) and pair-coherent (TMC, also known as two-mode-coher ent) states respectively. Under resonance conditions, equal interaction times for both qubits and different initial preparations, we find that the entanglement transfer is more efficient for TMC than for TWB states. In the perspective of applications such as in cavity QED or with superconducting qubits, we analyze in details the effects of off-resonance interactions (detuning) and different interaction times for the two qubits, and discuss conditions to preserve the entanglement transfer.

revised version, 11 pages, 7 figures (few of them low-res)

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Cited by in corpus (14)

• Quantifying non-Gaussianity for quantum information
• Non-Gaussianity of quantum states: an experimental test on single-photon added coherent states
• The role of initial entanglement and nonGaussianity in the decoherence of photon number entangled states evolving in a noisy channel
• Conditional measurements on multimode pairwise entangled states from spontaneous parametric downconversion
• Tripartite entanglement transfer from flying modes to localized qubits
• Vortex entanglement in Bose-Einstein condensates coupled to Laguerre-Gauss beams
• Sudden death and birth of entanglement beyond the Markovian approximation
• Enhancing non-classicality in mechanical systems
• Passing quantum correlations to qubits using any two-mode state
• Driven optomechanical systems for mechanical entanglement distribution
• Linear atomic quantum coupler
• Non-classical non-Gaussian state of a mechanical resonator via selectively incoherent damping in three-mode optomechanical systems
• Distributed manipulation of two-qubit entanglement with coupled continuous variables
• Identification of a natural fieldlike entanglement resource in trapped-ion chains