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Open Quantum Systems Decoherence Photonic Quantum Computing

Boosted linear-optical measurements on single-rail qubits with unentangled ancillas

arXiv

Authors: Aqil Sajjad, Isack Padilla, Saikat Guha

Year

2026

Paper ID

30676

Status

Preprint

Abstract Read

~2 min

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Abstract

Any quantum state of the radiation field, sliced in small non-overlapping space-time bins is a collection of single-rail qubits, each spanning the vacuum and single-photon Fock state of a mode. Quantum logic on these qubits would enable arbitrary measurements on information-bearing light, but is hard due to the lack of strong nonlinearities. With unentangled ancilla single-rail qubits, an 8-port interferometer and photon detection, we show any single-rail qubit measurement in the XY Bloch plane is realizable with success probability 147/256, which beats the prior-known 1/2 limit.

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This paper contributes to the Photonic Quantum Computing research area in the Quantum Articles archive.
It adds a 2026 reference point for readers tracking recent quantum research.
Any quantum state of the radiation field, sliced in small non-overlapping space-time bins is a collection of single-rail qubits, each spanning the vacuum and single-photon Fock...

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2603.16795 [2] arXiv https://arxiv.org/abs/2603.16795 [3] Publisher https://arxiv.org/abs/2603.16795

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