Boosted linear-optical measurements on single-rail qubits with unentangled ancillas
Fuente:
arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866910056415494144 |
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| author | Sajjad, Aqil Padilla, Isack Guha, Saikat |
| author_facet | Sajjad, Aqil Padilla, Isack Guha, Saikat |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_16795 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Boosted linear-optical measurements on single-rail qubits with unentangled ancillas Sajjad, Aqil Padilla, Isack Guha, Saikat Quantum Physics Information Theory 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. |
| title | Boosted linear-optical measurements on single-rail qubits with unentangled ancillas |
| topic | Quantum Physics Information Theory |
| url | https://arxiv.org/abs/2603.16795 |