Physical qubits from charged particles: IR divergences in quantum information

Details Physical qubits from charged particles: IR divergences in quantum information Physical qubits from charged particles: IR divergences in quantum information

2008-12-22

arxiv.org/abs/0812.4061v3

Physical Review A 79, 052309 (2009)

Physics

Quantum Physics

4 pages, 2 figures, RevTeX. Version 2: Some references updated

Scientific paper

10.1103/PhysRevA.79.052309

We consider soft photons effects (IR structure of QED) on the construction of physical qubits. Soft-photons appear when we build charged qubits from the asymptotic states of QED. This construction is necessary in order to include the effect of soft photons on entanglement measures. The nonexistence of free charged particles (due to the long range of QED interactions) lead us to question the sense of the very concept of free charged qubit. In this letter, using the "dressing" formalism, we build physical charged qubits from dressed fields which have the correct asymptotic behavior, are gauge invariant, their propagators have a particle pole structure and are free from infrared divergences. Finally, we discuss the impact of the soft corrections on the entanglement measures.

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