Dynamics of entanglement between two free atoms with quantized motion

Lastra, F.; Wallentowitz, S.

doi:10.1088/0953-4075/43/12/125501

Cited by 3 publications

(3 citation statements)

References 33 publications

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“…) whose dissipative (imaginary) part also features in the dynamics of entanglement between the two centres-see for example the recent work by Lastra and Wallentowitz [67]. The above result accommodates both near-field and wave-zone limits.…”

Section: Double Scatteringsupporting

confidence: 52%

The effect of scattering on single photon transmission of optical angular momentum

Andrews¹

2011

J. Opt.

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Schemes for the communication and registration of optical angular momentum depend on the fidelity of transmission between optical system components. It is known that electron spin can be faithfully relayed between exciton states in quantum dots; it has also been shown by several theoretical and experimental studies that the use of beams conveying orbital angular momentum can significantly extend the density and efficiency of such information transfer. However, it remains unclear to what extent the operation of such a concept at the single photon level is practicable—especially where this involves optical propagation through a material system, in which forward scattering events can intervene. The possibility of transmitting and decoding angular momentum over nanoscale distances itself raises other important issues associated with near-field interrogation. This paper provides a framework to address these and related issues. A quantum electrodynamical representation is constructed and used to pursue the consequences of individual photons, from a Laguerre–Gaussian beam, undergoing single and multiple scattering events in the course of propagation. In this context, issues concerning orbital angular momentum conservation, and its possible compromise, are tackled by identifying the relevant components of the electromagnetic scattering and coupling tensors, using an irreducible Cartesian basis. The physical interpretation broadly supports the fidelity of quantum information transmission, but it also identifies potential limitations of principle.

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Section: Double Scatteringsupporting

confidence: 52%

The effect of scattering on single photon transmission of optical angular momentum

Andrews¹

2011

J. Opt.

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“…Furthermore, the effects of coherent tunnelling could also be included in the future in a perturbative manner. Finally, future investigations of this promising quantum-computation device should include a study of the entanglement dynamics of two qubits (four donor sites) and its comparison with other implementations, such as for example free atoms [54,55].…”

Section: Discussionmentioning

confidence: 99%

Analytical model of non-Markovian decoherence in donor-based charge quantum bits

Lastra¹,

Reyes²,

Wallentowitz³

2010

J. Phys. B: At. Mol. Opt. Phys.

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We develop an analytical model for describing the dynamics of a donor-based charge quantum bit (qubit). As a result, the quantum decoherence of the qubit is analytically obtained and shown to reveal non-Markovian features: The decoherence rate varies with time and even attains negative values, generating a non-exponential decay of the electronic coherence and a later recoherence. The resulting coherence time is inversely proportional to the temperature, thus leading to low decoherence below a material dependent characteristic temperature.

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“…whose dissipative (imaginary) part also features in the dynamics of entanglement between the two centers [29] . The result accommodates both near-field and wave-zone limits.…”

Section: Fi R I F S I F T I F I T I S I R F H T T H R S H R R H I M Ementioning

confidence: 99%

Structured light, transmission, and scattering

Andrews

2011

SPIE Proceedings

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Numerous theoretical and experimental studies have established the principle that beams conveying orbital angular momentum offer a rich scope for information transfer. However, it is not clear how far it is practicable to operate such a concept at the single-photon level -especially when such a beam propagates through a system in which scattering can occur. In cases where scattering leads to photon deflection, it produces losses; however in terms of the retention of information content, there should be more concern over forward scattering. Based on a quantum electrodynamical formulation of theory, this paper aims to frame and resolve the key issues. A quantum amplitude is constructed for the representation of single and multiple scattering events in the propagation an individual photon, from a suitably structured beam. The analysis identifies potential limitations of principle, undermining complete fidelity of quantum information transmission.

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Dynamics of entanglement between two free atoms with quantized motion

Cited by 3 publications

References 33 publications

The effect of scattering on single photon transmission of optical angular momentum

The effect of scattering on single photon transmission of optical angular momentum

Analytical model of non-Markovian decoherence in donor-based charge quantum bits

Structured light, transmission, and scattering

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