Quantum Journal

Non-abelian quantum cellular automata: $1{+}1$-dimensional $SU(2)$ Yang--Mills with fermions

This work provides a digital quantum simulation scheme for $1{+}1$-dimensional $SU(2)$ Yang--Mills theory with Dirac fermions. It takes the form of a quantum circuit, infinitely repeating across space and time with $\Delta_t=\Delta_x=\varepsilon$, whose wires follow lightlike propagation. The construction mirrors the logic of the standard quantum field theory approach, transposed to the discrete setting. Namely, we start from the Dirac quantum w...

Quantum advantage in learning single mode bosonic channels

Quantum resources can dramatically reduce the data required to learn physical systems, with exponential improvements in sample complexity demonstrated in several quantum learning tasks. However, these advantages have typically relied on quantum resources that scale with problem complexity, most notably increasing system dimension or entanglement. This raises a fundamental question: can exponential quantum learning advantages arise within a fixed...

Bridging the Gap: Transitioning Quantum Computing from Theoretical Advantage to Practical Utility

The quantum computing landscape is shifting from demonstrating theoretical superiority to achieving practical utility. This transition requires moving beyond simple 'engineered advantages' toward scalable, reliable systems capable of solving real-world problems.

Nanjing University Enhances Quantum Key Distribution Rates for Three-User Networks

Researchers at Nanjing University have achieved a significant breakthrough in quantum communication by increasing key generation rates for three-user networks. This advancement addresses critical scalability hurdles in multi-user quantum key distribution (QKD) systems.