Quantum 9, 1947 (2025). https://doi.org/10.22331/q-2025-12-15-1947 We propose an algebraic geometry-inspired approach for constructing entangled subspaces within the Hilbert space of a multipartite quantum system. Specifically, our method employs a modified Veronese embedding, restricted to the […]
Quantum 9, 1946 (2025). https://doi.org/10.22331/q-2025-12-15-1946 Effective Hamiltonian calculations for large quantum systems can be both analytically intractable and numerically expensive using standard techniques. In this manuscript, we present numerical techniques inspired by Nonperturbative Analytical Diagonalization […]
Quantum 9, 1945 (2025). https://doi.org/10.22331/q-2025-12-15-1945 Entanglement distillation, the process of converting weakly entangled states into maximally entangled ones using Local Operations and Classical Communication (LOCC), is pivotal for robust entanglement-assisted quantum information processing in error-prone […]
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 […]
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 […]
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