6-qubit superconducting quantum processor

Raveh Neeman

doi:10.5281/zenodo.22674814

DRDO DYSL-QT with TIFR and TCS · superconducting circuits · DEMONSTRATED (end-to-end test) (28 Aug 2024) · 6 physical qubits · access: cloud interface (TCS) for education, research and testing

architecture: Transmon lattice with tunable couplers · Open on the map

Register profile — the machine's variant of its architecture

qubit type: superconducting-circuit qubit (type not published)

gate mechanism: not published

connectivity: TIFR ring-resonator architecture (shared multi-path coupling resonator)

control: commercial off-the-shelf electronics plus custom-programmed development boards (DYSL-QT)

control placement: room-temp

readout: not published

gate evidence: no published figure

flags: no published error rates, press sources only

Technologies by layer — the machine's cell per layer

1 Qubit carrier	Transmon · primary ▨ 🔎 superconducting-circuit qubits designed and fabricated at TIFR; the release does not name the qubit type
2 Encoding	Bare physical qubit (no encoding) · primary ◌ 🔎 bare two-level subspace assumed; no encoding beyond the physical qubit
3 Gate mechanism	— undisclosed — exists, nothing published ▨ 🔎 two-qubit gate mechanism and fidelities not published
4 Connectivity / transport	— (Atlas gap: ∅G-bus) · primary ▨ ✅ ring-resonator design invented at TIFR: qubits sit around one shared ring resonator used as a multi-path coupler (architecture paper: up to 12 qubits, each linked to 9 others)
5 Control	Room-temperature electronics + per-qubit coax/flex · primary ▨ ✅ control and measurement apparatus built by DYSL-QT from commercial off-the-shelf electronics and custom-programmed development boards; TCS cloud interface submits circuits
6 Readout	Dispersive microwave readout (+TWPA, Purcell) · primary ◌ 🔎 dispersive readout assumed (family-determined); not described
7 Code	— none — nothing in this layer ▨ 🔎 no QEC code run; end-to-end cloud-to-hardware test only
8 Decoder	— none — nothing in this layer ▨ 🔎 no decoder; no QEC run
9 Interconnect	— none — nothing in this layer ◌ 🔎 single 6-qubit processor; no inter-module link described
10 Manufacturing	Superconducting-qubit lithography (Al/AlOx/Al junctions, Nb wiring, 300 mm) · primary ▨ ✅ qubits designed and fabricated in-house at TIFR, Mumbai

evidence: ✅ 3 / 10