Steady-state entanglement of two coupled qubits

Valle, Elena del

doi:10.1364/josab.28.000228

Cited by 25 publications

(19 citation statements)

References 63 publications

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“…In cavity QED, there is mainly coherent coupling between the qubits, but no cross decay, and a coherently pumped cavity is unable to generate any significant concurrence. It would be possible to work with an incoherent pumping with cross terms 53,54 but, as mentioned previously, this scheme is experimentally more difficult than our proposal.…”

Section: B Stationary State Under External Continuous Pumpingmentioning

confidence: 87%

Dissipation-driven generation of two-qubit entanglement mediated by plasmonic waveguides

Martín-Cano¹,

et al. 2011

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We study the generation of entanglement between two distant qubits mediated by the surface plasmons of a metallic waveguide. We show that a V-shaped channel milled in a flat metallic surface is much more efficient for this purpose than a metallic cylinder. The role of the misalignments of the dipole moments of the qubits, an aspect of great importance for experimental implementations, is also studied. A careful analysis of the quantum dynamics of the system by means of a master equation shows that two-qubit entanglement generation is essentially due to the dissipative part of the effective qubit-qubit coupling provided by the surface plasmons. The influence of a coherent external pumping, needed to achieve a steady-state entanglement, is discussed. Finally, we pay attention to the question of how to get information experimentally on the degree of entanglement achieved in the system.

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Section: B Stationary State Under External Continuous Pumpingmentioning

confidence: 87%

Dissipation-driven generation of two-qubit entanglement mediated by plasmonic waveguides

Martín-Cano¹,

et al. 2011

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“…In order to achieve a stationary-state a continuous pumping is required. The pumping of the qubits may have incoherent nature 23 or one could use coherent excitation, i.e. a laser field.…”

Section: Steady-state Entanglementmentioning

confidence: 99%

Exploring qubit‐qubit entanglement mediated by one‐dimensional plasmonic nanowaveguides

González-Tudela

Martín-Cano

Moreno

et al. 2012

Phys. Status Solidi C

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We exploit the qubit-qubit coupling induced by plasmon-polariton modes in a one-dimensional nanowaveguide to obtain various two-qubit entanglement situations. Firstly, we observe three phenomena occurring when preparing the initial state of the system and leaving it freely relax: spontaneous formation of entanglement, sudden birth and revival. Then, we show that plugging a laser to each of the qubit, the system arrives to an steady state which, depending on their inter-qubit distance, can also be entangled. For this situation, we also characterize the quantum state of the system showing the entanglement-purity-diagram typical for two-qubit systems.

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“…The two-photon correlation properties of the squeezed light is found to be effective in generating two qubit entanglement even for interqubit separations more than the operational wavelength. Incoherently pumping the less dissipative qubit [5] then leads to significant steady state concurrence [6] in our scheme: 0.8 for asymmetric and 0.6 for identical qubits in realistic parameter regime.…”

mentioning

confidence: 92%

Entanglement of two spatially separated qubits via correlated photons

Sete

Das²

2012

Opt. Lett.

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We show that a high degree of steady-state entanglement between two spatially separated and initially uncoupled qubits can be achieved via interaction with a quantized squeezed field in a cavity. The cavity field induces two-photon coherence, which is crucial in creating entanglement between the qubits. Optimum entanglement is obtained when the less dissipative qubit is incoherently pumped while the other dissipates the excitation. Given the current state-of-the-art in cavity quantum electrodynamics and squeezed light sources, our scheme presents an effective way for light-to-matter entanglement transfer.

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Steady-state entanglement of two coupled qubits

Cited by 25 publications

References 63 publications

Dissipation-driven generation of two-qubit entanglement mediated by plasmonic waveguides

Dissipation-driven generation of two-qubit entanglement mediated by plasmonic waveguides

Exploring qubit‐qubit entanglement mediated by one‐dimensional plasmonic nanowaveguides

Entanglement of two spatially separated qubits via correlated photons

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