Ability of unbounded pairs of observers to achieve quantum advantage in random access codes with a single pair of qubits

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Ability of unbounded pairs of observers to achieve quantum advantage in random access codes with a single pair of qubits

Das, Debarshi; Ghosal, Arkaprabha; Maity, Ananda G; Kanjilal, Som; Roy, Arup; (2021) Ability of unbounded pairs of observers to achieve quantum advantage in random access codes with a single pair of qubits. Physical Review A , 104 (6) , Article L060602. 10.1103/PhysRevA.104.L060602. Green open access

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Abstract

Complications in preparing and preserving quantum correlations stimulate recycling of a single quantum resource in information processing and communication tasks multiple times. Here, we consider a scenario involving multiple independent pairs of observers acting with unbiased inputs on a single pair of spatially separated qubits sequentially. In this scenario, we address whether more than one pair of observers can demonstrate quantum advantage in some specific $2 \rightarrow 1$ and $3 \rightarrow 1$ random access codes. Interestingly, we not only address these in the affirmative, but also illustrate that unbounded pairs can exhibit quantum advantage. Furthermore, these results remain valid even when all observers perform suitable projective measurements and an appropriate separable state is initially shared.

Type:	Article
Title:	Ability of unbounded pairs of observers to achieve quantum advantage in random access codes with a single pair of qubits
Open access status:	An open access version is available from UCL Discovery
DOI:	10.1103/PhysRevA.104.L060602
Publisher version:	http://dx.doi.org/10.1103/PhysRevA.104.L060602
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, DIMENSION WITNESS VIOLATION
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/10165224