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Open Quantum Systems Decoherence

Relativistically covariant state-dependent cloning of photons

arXiv
Authors: K. Bradler, R. Jauregui

Year

2007

Paper ID

50129

Status

Preprint

Abstract Read

~2 min

Abstract Words

96

Citations

N/A

Abstract

The influence of the relativistic covariance requirement on the optimality of the symmetric state-dependent 1 -> 2 cloning machine is studied. Namely, given a photonic qubit whose basis is formed from the momentum-helicity eigenstates, the change to the optimal cloning fidelity is calculated taking into account the Lorentz covariance unitarily represented by Wigner's little group. To pinpoint some of the interesting results, we found states for which the optimal fidelity of the cloning process drops to 2/3 which corresponds to the fidelity of the optimal classical cloner. Also, an implication for the security of the BB84 protocol is analyzed.

Why This Paper Matters

  • This paper contributes to the Open Quantum Systems & Decoherence research area in the Quantum Articles archive.
  • It adds a 2007 reference point for readers tracking recent quantum research.
  • The influence of the relativistic covariance requirement on the optimality of the symmetric state-dependent 1 -> 2 cloning machine is studied.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:0705.4291 [2] arXiv https://arxiv.org/abs/0705.4291 [3] Publisher https://arxiv.org/abs/0705.4291

Local Citation Graph (Related-Paper Links)

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