Quantum Certification Conference+ (QUACC+) organized by CFT PAN, 12-14 May 2025, part of QuantERA project "Verification of Quantum Technologies, Applications and Systems"

#QuantumCertification #QuantumTechnologies

www.quantiki.org/conference/q...

Develops device-independent self-testing protocol for multi-qubit GHZ states using Bell inequality violations, achieving explicit O(√ε) noise-robust bounds without assumptions on measurement dimensions or devices.

#QuantumCertification #BellInequalities #Research

Novel methods for certifying quantum properties via trace powers: detects entangled states, non-Hermitian operators, and non-positive matrices. Algorithms achieve 99.8% success with minimal computational cost, implementable on NISQ devices.

#QuantumCertification #EntanglementDetection #Research

Novel framework determines when mixed quantum states are uniquely fixed by local marginals, establishing sharp rank bounds (≤4) for three-qubit systems. Extends to multipartite states with applications to genuine multipartite entanglement certification.

#QuantumInfo #QuantumCertification #Research

Researchers prove single-qubit measurements in two bases suffice for robust certification of nearly all quantum states, achieving optimal copy complexity through novel uncertainty principles for Boolean function influence.

#QuantumInformation #QuantumCertification #QuantumTheory

Pakhunov proves the NPA hierarchy exhibits a phase transition at the critical CHSH line: exact at all levels for α,β≥1, but requires diverging levels subcritically. The obstruction is the Motzkin polynomial—nonnegative but not sum-of-squares.

#QuantumCertification #BellInequalities #Research

Circumvents Naimark dilation to directly certify non-unitary quantum measurements in Bell tests, deriving analytic O(√ε) robustness bounds that reveal the severe practical cost of realistic POVMs versus idealized projective models.

#DeviceIndependent #QuantumCertification #BellInequalities

Novel framework enables rigorous quantum state verification and certification accounting for drift, memory effects, and correlated noise—achieving standard performance without unrealistic i.i.d. assumptions.

#QuantumCertification #QuantumVerification #QuantumHardware

Quantum proper-time histories can be certified nonclassical through coherent recombination, which classical random-time distributions cannot explain. We provide a minimal two-branch Ramsey witness for trapped-ion optical clock implementations.

#QuantumClocks #QuantumCertification #Research

Novel algorithms achieve optimal query complexity Θ(1/ε) for testing depolarizing noise in quantum channels, independent of qubit count—directly advancing practical verification methods for fault-tolerant quantum computers.

#QuantumCertification #QuantumErrorCorrection #Research

New self-testing protocol certifies quantum states and measurements with arbitrary measurement inputs using sum-of-squares optimization, including rigorous robustness analysis for practical noisy quantum systems.

#QuantumCertification #DeviceIndependent #Research

Breakthrough: Device-independent certification of multipartite quantum states now scales polynomially, overcoming exponential sample complexity barrier. Enables practical verification for scalable quantum networks.

#DeviceIndependent #QuantumCertification #Research

Analytical study identifies Svetlichny operator-based self-testing as most robust protocol for device-independent certification of GHZ states, enabling practical verification in noisy quantum systems.

#QuantumEntanglement #DeviceIndependent #QuantumCertification

New protocol for quantum state certification achieves near-optimal copy complexity using only limited entanglement (d² copies), avoiding fully entangled measurements while maintaining efficiency for device calibration and characterization.

#QuantumTesting #QuantumCertification #Research