Quantum Journal

Advancements in Error Mitigation Signal Progress Toward Reliable Quantum Computing

New developments in quantum error mitigation are narrowing the gap between theoretical potential and practical utility. These advancements are critical for transitioning from noisy intermediate-scale quantum (NISQ) devices to fault-tolerant systems.

Advancing Quantum Frontiers: Insights from Peter Stano’s Colloquium at QUTE.sk

Slovak scientist Peter Stano presented a comprehensive overview of current quantum advancements during a recent colloquium. The session highlighted critical progress in quantum theory and practical applications within the global research landscape.

Dephasing-driven suppression of superradiance and metastable dynamics in the anisotropic open Rabi model

Finite-component light-matter systems realize dissipative phase transitions in a single controllable atom-cavity setup, but how atomic dephasing - ubiquitous in real cavity- and circuit-QED devices - affects this criticality remains unknown. We study the anisotropic open Rabi model under cavity decay, spontaneous emission, and atomic dephasing together. We show that when spontaneous emission stabilizes a long-lived metastable superradiant phase,...

Log-depth entanglement transition in hypercube Gaussian boson sampling

We study an entanglement transition at logarithmic depth in random hypercube linear optical networks. Starting from an initial Gaussian state with all modes squeezed, we prove that random hypercube linear optical networks on $n$ modes generate ensemble-averaged subsystem entanglement within a constant factor of its maximum in all subsystems at circuit depth $\Theta(\log n)$. Below depth $\log_2n$, there is an extensive subsystem with no entangle...