PT-2

Raveh Neeman

doi:10.5281/zenodo.22674814

ORCA Computing · photonics · DEPLOYED (2024-2026) · qubits not published · access: on-prem sold (NQCC photonic testbed, delivered from Q1 2025)

architecture: Boson sampler · Open on the map

Register profile — the machine's variant of its architecture

qubit type: non-Gaussian photon-subtracted squeezed states in time bins (PT-1 used single photons)

gate mechanism: programmable time-bin interferometer: fibre delay loops + variable beamsplitters; linear-optical interference only, no heralded entangling gate published

connectivity: fibre loops + variable couplers

control: room-temperature electronics; NVIDIA NVQLink integration

control placement: room-temp electro-optic

readout: photon-number-resolving detection; detector technology not stated in the sources opened

gate evidence: no published figure

flags: source not confirmed, specification absent

Technologies by layer — the machine's cell per layer

1 Qubit carrier	Squeezed light mode (CV) · primary ▤ §2.2 Physical devices ✅ PT-2 'samples from non-Gaussian, photon-subtracted squeezed states, rather than single photons as in the PT-1'
2 Encoding	— none — nothing in this layer ◌ §2.2 Physical devices 🔎 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 ✅ time-bin interferometer with one or two fibre loops and variable beam splitters (angle θ); linear-optical only
4 Connectivity / transport	Photonic switching / routing (electro-optic, feed-forward) · primary ▤ §2.2 Physical devices ✅ fibre delay loops with variable beam splitters, single- and double-loop configurations
5 Control	Electro-optic drive + feed-forward electronics (room temperature) · primary ▦ 🔎 room-temperature electronics; NVIDIA NVQLink integration (Oct 2025)
6 Readout	Single-photon detection (SNSPD / TES) · primary ▤ §2.2 Physical devices ✅ photon-number-resolving detector
7 Code	— none — nothing in this layer ▦ 🔎 no QEC code; no code, decoder or roadmap code family found; sampling / ML machine
8 Decoder	— none — nothing in this layer ▦ 🔎 no decoder; no real-time processing
9 Interconnect	— none — nothing in this layer ◌ 🔎 no interconnect; single rack-mounted system
10 Manufacturing	Bulk-optics and fibre assembly (photonic samplers) · primary ◌ 🔎 fibre / bulk-optics assembly; no PIC foundry route published

evidence: ✅ 4 / 10