Experimental realisation of generalised qubit measurements based on quantum walks

2015/01/21 by Yuanyuan Zhao, Zhao, Yuan-yuan, Nengkun Yu +9 · 1 citation
Computer Science · #FOS: Physical sciences #Neural Networks and Reservoir Computing #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Physics (quant-ph)

paper · pdf · doi:10.48550/arxiv.1501.05096

openalex publication_date 2015/01/21 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We report an experimental implementation of a single-qubit generalised measurement scenario(POVM) based on a quantum walk model. The qubit is encoded in a single-photon polarisation. The photon performs a quantum walk on an array of optical elements, where the polarisation-dependent translation is performed via birefringent beam displacers and a change of the polarisation is implemented with the help of wave-plates. We implement: (i) Trine-POVM, i.e., the POVM elements uniformly distributed on an equatorial plane of the Bloch sphere; (ii) Symmetric-Informationally- Complete (SIC) POVM; and (iii) Unambiguous Discrimination of two non-orthogonal qubit states.

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