PT-1

Raveh Neeman

doi:10.5281/zenodo.22674814

ORCA Computing · photonics · DEPLOYED (two systems delivered to PSNC Poznań, 2023; two ordered by Montana State University, Jun 2024) (2023 (PSNC, two systems); Montana State University order Jun 2024) · qubits not published · access: on-prem sold (PSNC Poznań x2, 2023; Montana State University x2, ordered Jun 2024)

architecture: Boson sampler · Open on the map

Register profile — the machine's variant of its architecture

qubit type: single photons in time bins (PT-2 moved to photon-subtracted squeezed states)

gate mechanism: programmable time-bin interferometer: fibre delay loops + beam splitters; linear-optical interference only, no entangling gate

connectivity: fibre delay loops + variable beam splitters

control: rack-mounted, air-cooled, room temperature, built with optical fibre components

control placement: room-temp electro-optic

readout: single-photon detection (one detector for the time-bin stream; type not stated)

gate evidence: no published figure

flags: specification absent

Technologies by layer — the machine's cell per layer

1 Qubit carrier	Single photon (discrete variable) · primary ▤ §2.2 Physical devices ✅ single photons; PT-2 samples photon-subtracted squeezed states 'rather than single photons as in the PT-1'
2 Encoding	— none — nothing in this layer ◌ 🔎 no qubit encoding (time-bin modes of the fibre-loop interferometer)
3 Gate mechanism	Programmable linear-optical interferometer (no entangling primitive) · primary ▤ §2.2 Physical devices ✅ PT-Series time-bin interferometer: photons enter one channel at interval τ, fibre loops as delay lines, beam splitters send each photon on or back into a loop
4 Connectivity / transport	Photonic switching / routing (electro-optic, feed-forward) · primary ▤ §2.2 Physical devices ✅ fibre delay loops with beam splitters routing time bins
5 Control	Electro-optic drive + feed-forward electronics (room temperature) · primary ▦ 🔎 room-temperature, rack-mounted, air-cooled system; electronics not described
6 Readout	Single-photon detection (SNSPD / TES) · primary ▤ §2.2 Physical devices ('only a single photon detection device') ✅ a single photon-detection device serves the time-bin interferometer; detector type not stated
7 Code	— none — nothing in this layer ▦ 🔎 no QEC code; sampling / ML machine
8 Decoder	— none — nothing in this layer ▦ 🔎 no decoder
9 Interconnect	— none — nothing in this layer ◌ 🔎 no interconnect; single rack-mounted system
10 Manufacturing	Bulk-optics and fibre assembly (photonic samplers) · primary ▦ 'Rack-mounted, room temperature and built with optical fibre components' ✅ rack-mounted system 'built with optical fibre components'

evidence: ✅ 5 / 10