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

• URL: http://arxiv.org/abs/2603.16795v1
• Date: Tue, 17 Mar 2026 17:03:53 GMT
• Title: Boosted linear-optical measurements on single-rail qubits with unentangled ancillas
• Abstract summary: Any quantum state of the radiation field is a collection of single-rail qubits, each spanning the vacuum and single-photon Fock state of a mode.<n>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.
• Score: 0.904861150954008
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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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