Quantum 9, 1944 (2025). https://doi.org/10.22331/q-2025-12-15-1944 Recent years have seen a surge of interest in exceptional points in open quantum systems. The natural approach in this area has been the use of Markovian master equations. While […]
Category: quantumjournal
Quantum 9, 1943 (2025). https://doi.org/10.22331/q-2025-12-12-1943 Secure Delegated Quantum Computation (SDQC) protocols are a vital piece of the future quantum information processing global architecture since they allow end-users to perform their valuable computations on remote quantum […]
Quantum 9, 1942 (2025). https://doi.org/10.22331/q-2025-12-12-1942 Variational quantum algorithms (VQAs) represent a promising pathway toward achieving practical quantum advantage on near-term hardware. Despite this promise, for generic, expressive ansätze, their scalability is critically hindered by barren […]
Quantum 9, 1941 (2025). https://doi.org/10.22331/q-2025-12-12-1941 The Entropy Accumulation Theorem (EAT) was introduced to significantly improve the finite-size rates for device-independent quantum information processing tasks such as device-independent quantum key distribution (QKD). A natural question would […]
Quantum 9, 1940 (2025). https://doi.org/10.22331/q-2025-12-11-1940 (i) We point out that every local unitary circuit of depth smaller than the linear system size is easily distinguished from a global Haar random unitary if there is a […]
Quantum 9, 1939 (2025). https://doi.org/10.22331/q-2025-12-11-1939 We propose a Bell test experiment using momentum-entangled atom pairs of different masses, specifically metastable helium isotopes ${}^{3}He^{*}$ and ${}^{4}He^{*}$, though the method extends to other atom species. Entanglement is […]
Quantum 9, 1938 (2025). https://doi.org/10.22331/q-2025-12-11-1938 The detection and quantification of non-Markovianity, a.k.a. memory, in quantum systems is a central problem in the theory of open quantum systems. There memory is as a result of the […]
Quantum 9, 1937 (2025). https://doi.org/10.22331/q-2025-12-11-1937 We present a finite-size security proof of the decoy-state BB84 QKD protocol against coherent attacks, using entropic uncertainty relations, for imperfect detectors. We apply this result to the case of […]
Quantum 9, 1936 (2025). https://doi.org/10.22331/q-2025-12-11-1936 Recently, usage of detecting regions facilitated the discovery of new circuits for fault-tolerantly implementing the surface code. Building on these ideas, we present LUCI, a framework for constructing fault-tolerant circuits […]
Quantum 9, 1935 (2025). https://doi.org/10.22331/q-2025-12-10-1935 Quantum groups have been widely explored as a tool to encode possible nontrivial generalisations of reference frame transformations, relevant in quantum gravity. In quantum information, it was found that the […]
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