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Experimental Proposal for Validation of W-state Protocol for Qubits and Qudits

Rohit K. Ramakrishnan, Aravinth Balaji Ravichandran, Srinivas Talabattula, Anindya Banerji, Nijil Lal, Sarika Mishra, Ravindra Pratap Singh, Peter P. Rohde

Published Jan 1, 2023• 0 citations
Publisher

Abstract

This paper presents an experimental scheme to validate W-state encoding, a passive linear optics error-correction scheme for qubits and qudits. We use the orbital angular momentum of photons to realize qubits and qudits.
DOI
10.1364/cleo_at.2023.jth2a.30

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The bit rate for photonic quantum-state transmission can be raised by encoding more than one bit per photon, using multiple temporal, spatial, polarization, and frequency modes and preparing a single photon in a superposition of these modes as a $q\phantom{\rule{0}{0ex}}u\phantom{\rule{0}{0ex}}d\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}t$. As always, state dephasing limits the performance of such technologies. This study shows that the qudit approach cannot be ramped up to arbitrarily high quantum numbers of orbital angular momentum---but there is a path to passive linear optical elements that can mitigate the inevitable dephasing and keep fidelity high.