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Quantum Journal
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Research
Research coverage · 1427 articles · newest first
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RESEARCH
Preparing Business Systems for Post Quantum Security - Global Banking & Finance Review
Advancing Fault-Tolerance: New Milestone in Quantum Error Correction
Government to expand quantum communications demonstration network nationwide, invest 7.4 billion won this year - 매일경제
Quantum Cryptography Test Network to Expand Nationwide... KT, SK Broadband Also to Pursue Overseas Demonstrations - 아시아경제
Concurrent Entanglement Purification Scheduling in Dynamic Quantum Networks
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RESEARCH
Polynomial-Time Classical Simulation of BosonSampling under Any Constant-Fraction Photon Loss
Understanding how photon loss changes the classical complexity of BosonSampling is central to assessing the robustness of near-term photonic quantum advantage. In this work, we present a polynomial-time classical simulation algorithm for lossy BosonSampling that applies whenever a constant fraction of the input photons survives. We consider the standard fixed-loss model, where $N$ input photons propagate through an $M$-mode interferometer and ex...
RESEARCH
Cavity models of non-Abelian gauge theories
In quantum optics and related fields, cavity quantum electrodynamics provides a powerful framework for modeling the low-energy properties of bound charges coupled to electromagnetic fields, using a minimal set of atomic levels and isolated photonic modes. Here, we develop a similar framework for non-Abelian gauge theories, focusing on the pure-gauge dynamics of SU(2) fields as the conceptually simplest example. Starting from the corresponding Ya...
RESEARCH
R\'enyi multi-entropy of graph states and the $n -> 1$ limit
R\'enyi multi-entropy extends the R\'enyi entropy to pure states of more than two parties. It is defined by a replica contraction at integer replica number $n$, and the multi-entropy is its $n\to1$ limit. In holography this limit is conjectured to compute the area of a minimal soap-film web in the bulk. Understanding multi-entropy for general states, however, is harder. Unlike the bipartite case, the replica contraction is not a moment of a dens...
RESEARCH
A hidden rivalry between two quantum states at the heart of superconductors
Transmitting electricity without losing any energy may sound impossible, yet this is precisely the promise of superconductivity. For nearly 40 years, scientists have been working to understand materials that exhibit this remarkable property at relatively high temperatures. Unlocking their secrets could one day help make power grids more efficient, enhance medical technologies and support the development of quantum computing.
