Quantum information transfer using weak measurements and any non-product resource state

TL;DR

This paper introduces a protocol for remote quantum state determination using weak measurements and non-product resource states, enabling efficient quantum communication even with low-dimensional resources.

Contribution

It presents a novel scheme combining weak measurements and non-product resource states for remote quantum state transfer, applicable to states of any dimension.

Findings

Remote state determination achieved with low-dimensional resource states.

Single measurement setting suffices for pure state transfer.

Protocol applicable to states of arbitrary dimension.

Abstract

Information about an unknown quantum state can be encoded in weak values of projectors belonging to a complete eigenbasis. We present a protocol that enables one party -- Bob -- to remotely determine the weak values corresponding to weak measurements performed by another spatially separated party -- Alice. The particular set of weak values contains complete information of the quantum state encoded on Alice's register, which enacts the role of preselected system state in the aforementioned weak measurement. Consequently, Bob can determine the quantum state from these weak values, which can also be termed as remote state determination or remote state tomography. A combination of non-product bipartite resource state shared between the two parties and classical communication between them is necessary to bring this statistical scheme to fruition. Significantly, the information transfer of a pure quantum state of any known dimensions can be effected even with resource states of low dimensionality and purity with a single measurement setting at Bob's end. Keywords: Remote state determination; Quantum communication; Non-classical correlations; Weak Values; Quantum resource states; Quantum teleportation; Quantum key distribution (QKD).