Demonstrated generation and 30-meter transfer of microwave photons shaped in orthogonal temporal modes with mode-selective absorption (40:1 selectivity). Enables new photonic degree of freedom for quantum networking and error correction.
#QuantumNetworking #SuperconductingQubits #Research
Systematic study shows light fluxoniums resist measurement-induced state transitions better than heavy variants due to lower multi-photon resonance density and harmonic-like charge operator structure. Key for optimizing high-fidelity quantum readout.
#SuperconductingQubits #QuantumReadout #Research
TOHOKU UNIVERSITY patent filing describes a magnetic flux superconducting quantum circuit that improves coherence time and achieves high density through optimized Josephson junction geometry without additional capacitors.
#SuperconductingQubits #QuantumComputing #Patent
U. Pittsburgh's circuit QED micromaser couples a SNAIL to a transmon qubit on sapphire, achieving 54Hz maser linewidth vs 19.7kHz bare cavity via microwave-pumped population inversion across three pump cycles and a 50MHz tuning range.
#CircuitQED #SuperconductingQubits #News
Rigetti's Cepheus-1-108Q, built from 12×9-qubit chiplets, delivers 99.1% median two-qubit gate fidelity at ~60ns—tripling prior qubit count. Now live on QCS & Amazon Braket; 99.5% fidelity targeted later in 2026.
#RigettiComputing #SuperconductingQubits #QuantumComputing
ETH Zürich team achieves record transmon qubit reset with residual excited-state population below 10⁻⁴ — 1-2 orders of magnitude better than prior schemes — using iSWAP gates to a phononic HBAR bath without active feedback.
#SuperconductingQubits #QuantumHardware #Research
A fast-sealing Cu cavity places Nb resonators under vacuum within 5 min of HF etching, achieving quality factors >2.5×10⁶ at single-photon power and enabling quantitative extraction of Nb₂O₅ regrowth kinetics and metal-air interface loss tangent.
#SuperconductingQubits #QuantumHardware #Research
Novel coupler-assisted scheme uses unconventional nonadiabatic geometric trajectories (triangle-cap, χ=0.43π) to simultaneously suppress ZZ crosstalk and maintain fast, high-fidelity CZ/CP gates without complex pulse shaping or auxiliary qubits.
#SuperconductingQubits #QuantumGates #Research
3WM JTWPAs exhibit >10dB pump phase noise regrowth at high frequency offsets—unlike 4WM—driven by even-order nonlinearities and cyclo-stationary noise correlation. Validated via Keysight ADS Harmonic Balance simulation and polynomial amplifier modeling.
#JTWPA #PhaseNoise #SuperconductingQubits
Nb/Ta bilayer CPW resonators achieve internal Q up to 2.4×10⁶ near single-photon regime via in-situ Ta capping that suppresses lossy NbOx. After 6 months aging, encapsulated devices still outperform freshly fabricated bare-Nb resonators.
#SuperconductingQubits #QuantumHardware #Research
Rigetti's Cepheus-1-108Q uses 12 interconnected 9-qubit chiplets achieving 99.1% median 2-qubit gate fidelity at ~60ns. Now live on QCS & Amazon Braket as the industry's largest modular quantum system, targeting fault-tolerant computing in ~3 years.
#QuantumComputing #SuperconductingQubits #Rigetti
Researchers propose applying small static offsets to tunable system parameters to suppress quantum state leakage without modifying control pulses or adding time overhead, achieving >99.9% gate fidelity in superconducting qubit simulations.
#QuantumControl #SuperconductingQubits #Research
Researchers achieved 99.37% charge-parity mapping fidelity using a spin-echo-based EchoCPM protocol on an offset-charge-tunable transmon, with continuous detection at 93.4% fidelity over 4µs intervals, paving the way for meV-scale particle detectors.
#SuperconductingQubits #QuantumSensing #Research
Researchers at Universidade Federal de São Carlos designed a two-layer superconducting architecture using a DC-SQUID, fluxonium qubit & 2 ancillary qubits, achieving all 5 universal CV gates with >98% fidelity — a first for superconducting platforms.
#QuantumHardware #SuperconductingQubits #News
Fuzhou Univ. researchers achieved >99.6% fidelity entanglement between a superconducting qubit and squeezed cavity via parametric drive and adiabatic passage—bypassing ultra-strong coupling for fault-tolerant QC and quantum metrology.
#QuantumEntanglement #SuperconductingQubits #QuantumMetrology
Simulations show a remote controlled-Z gate exceeding 99.99% fidelity between fixed-frequency transmon qubits in separate modules linked by a 25cm coaxial cable, using double-transmon couplers with cross-Kerr on/off ratio >10^6.
#SuperconductingQubits #ModularQuantum #News
A Born-Oppenheimer effective single-mode model for double-junction superconducting qubits achieves 1–2 orders of magnitude accuracy improvement over classical models, with exponentially suppressed charge-noise sensitivity for EJΣ/Eint_C ≳ 30.
#SuperconductingQubits #JosephsonHarmonics #Research
Researchers linked Al electrode thickness & grain size to TLS defect density in 6,000 Josephson junctions, achieving a 2/3 reduction in TLS density via thicker electrodes—a key step toward scalable superconducting qubits.
#SuperconductingQubits #QuantumHardware #Research
On-FPGA co-location of pulse generation, acquisition, and analysis achieves T1 estimation in 10ms, pulse calibration in 1ms, and 74,000+ recalibrations over 6hrs, reducing gate infidelity 6.4% vs static baseline.
#SuperconductingQubits #QuantumControl #Research
Nobel laureate John Martinis explains how flux-tunable superconducting qubits demand noise control at ~10μV levels, single-point grounding, and direct measurement over assumption — announcing the John Martinis Prize for hands-on qubit access.
#SuperconductingQubits #QuantumControl #News
Rigetti achieved 99.9% two-qubit gate fidelity at 28ns via a proprietary adiabatic CZ scheme, secured an $8.4M C-DAC order for a 108-qubit on-prem system, and closed 2025 with $589.8M cash despite $7.1M revenue and $50.5M non-GAAP net loss.
#SuperconductingQubits #QuantumHardware #News
Rigetti and QphoX show superconducting qubits can be read out via optical transducer, enabling a compact, modular alternative to microwave amplification—potentially boosting scalability in quantum computing systems.
#SuperconductingQubits #QuantumHardware #News
QphoX & Bluefors replaced coaxial cables with optical fiber + cryogenic photodiode to control a transmon qubit in a Bluefors LD400, preserving coherence while slashing thermal load — a scalability breakthrough for large quantum processors.
#SuperconductingQubits #OpticalControl #QuantumHardware
SEEQC co-integrated SFQ digital control circuits with a 5-qubit processor at 10mK via chip-to-chip bonding, validated in Nature Electronics. Digital multiplexing cuts wiring complexity, marking a scalable path for superconducting quantum architecture.
#QuantumComputing #SuperconductingQubits #SEEQC
OQC integrated Purcell filters into multilayer PCB packaging—a first—using 10 GHz bandpass triangular coplanar patch antennas supporting 9-channel multiplexed readout on a 35-qubit chip, boosting coherence without increasing processor footprint.
#SuperconductingQubits #QuantumHardware #News
A fixed three-step protocol generates arbitrary-N NOON states in two superconducting microwave cavities via a five-level qudit, using only linear interactions and optimal control, achieving >90% fidelity under realistic decoherence.
#QuantumMetrology #SuperconductingQubits #Research
Qolab, IQCC & Quantum Machines launch a grant program awarding processor time, stipends & conference access to advance superconducting qubit hardware. A cryogenic filter partnership with Singapore's NQFF and a university fab program also announced.
#SuperconductingQubits #QuantumHardware #News
A cos(2φ) transmon qubit achieves 100× suppression of charge matrix element via Cooper-pair parity symmetry, yielding T₁=70μs. Coherent control & single-shot readout demonstrated; 1/f flux noise identified as dominant remaining error channel.
#SuperconductingQubits #QuantumErrorProtection #Research
Chinese researchers achieve >99.9% single-qubit gate fidelities on a C-shunt flux qubit combining 848 MHz anharmonicity with T1=23µs coherence, using DRAG pulses and randomized benchmarking — surpassing fault-tolerance thresholds.
#SuperconductingQubits #QuantumComputing #Research
Seeqc integrated SFQ digital control electronics with superconducting qubits via flip-chip bonding in a single multi-chip module, using digital demultiplexing to break linear wiring scaling. Single-qubit gate fidelities up to 99.9% demonstrated.
#QuantumComputing #SuperconductingQubits #News
