Characterizing qubit channels in the context of quantum teleportation

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Characterizing qubit channels in the context of quantum teleportation

Ghosal, Arkaprabha; Das, Debarshi; Banerjee, Subhashish; (2021) Characterizing qubit channels in the context of quantum teleportation. Physical Review A , 103 (5) , Article 052422. 10.1103/PhysRevA.103.052422. Green open access

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Abstract

We consider a scenario where a party, say, Alice prepares a pure two-qubit (either maximally entangled or non-maximally entangled) state and sends one half of this state to another distant party, say, Bob through a qubit (either unital or non-unital) channel. Finally, the shared state is used as a teleportation channel. In this scenario, we focus on characterizing the set of qubit channels with respect to the final state's efficacy as a resource of quantum teleportation (QT) in terms of maximal average fidelity and fidelity deviation (fluctuation in fidelity values over the input states). Importantly, we point out the existence of a subset of qubit channels for which the final state becomes useful for universal QT (having maximal average fidelity strictly greater than the classical bound and having zero fidelity deviation) when the initially prepared state is either useful for universal QT (i.e., for a maximally entangled state) or not useful for universal QT (i.e., for a subset of non-maximally entangled pure states). Interestingly, in the latter case, we show that non-unital channels (dissipative interactions) are more effective than unital channels (non-dissipative interactions) in producing useful states for universal QT from non-maximally entangled pure states.

Type:	Article
Title:	Characterizing qubit channels in the context of quantum teleportation
Open access status:	An open access version is available from UCL Discovery
DOI:	10.1103/PhysRevA.103.052422
Publisher version:	http://dx.doi.org/10.1103/PhysRevA.103.052422
Language:	English
Additional information:	This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords:	Science & Technology, Physical Sciences, Optics, Physics, Atomic, Molecular & Chemical, Physics, STATE, ENTANGLEMENT, DECOHERENCE, OPERATIONS, DYNAMICS, MAPS
UCL classification:	UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI:	https://discovery.ucl.ac.uk/id/eprint/10165226