Quantum 10, 2154 (2026). https://doi.org/10.22331/q-2026-07-08-2154 Semidefinite programming (SDP) is a fundamental convex optimization problem with wide-ranging applications. However, solving large-scale instances remains computationally challenging due to the high cost of solving linear systems and performing […]
Quantum 10, 2153 (2026). https://doi.org/10.22331/q-2026-07-08-2153 The state of a finite-dimensional quantum system is described by a density matrix that can be decomposed into a real diagonal, a real off-diagonal and and an imaginary off-diagonal part. […]
Quantum 10, 2152 (2026). https://doi.org/10.22331/q-2026-07-01-2152 Non-local quantum computation (NLQC) replaces a local interaction between two systems with a single round of communication and shared entanglement. Despite many partial results, it is known that a characterization […]
Quantum 10, 2151 (2026). https://doi.org/10.22331/q-2026-07-01-2151 The characterization of Hamiltonians and other components of open quantum dynamical systems plays a crucial role in quantum computing and other applications. Scientific machine learning techniques have been applied to […]
Quantum 10, 2150 (2026). https://doi.org/10.22331/q-2026-07-01-2150 We provide a complete mathematical theory for the entanglement of mixtures of Dicke states. These quantum states form an important subclass of bosonic states arising in the study of indistinguishable […]
Quantum 10, 2149 (2026). https://doi.org/10.22331/q-2026-06-30-2149 Fault-tolerant quantum computers will depend crucially on the performance of the classical decoding algorithm which takes in the results of measurements and outputs corrections to the errors inferred to have […]
Quantum 10, 2148 (2026). https://doi.org/10.22331/q-2026-06-30-2148 The quantum Zeno effect is a fundamental mechanism for implementing the effective dynamics of projected Hamiltonian and Lindbladian systems. It approximates the target projected evolution by interleaving Hamiltonian or Lindblad […]
Quantum 10, 2147 (2026). https://doi.org/10.22331/q-2026-06-30-2147 There has been a surge of recent interest in the Wigner’s Friend paradox, sparking several novel thought experiments and no-go theorems. The main narrative has been that Wigner’s Friend highlights […]
Quantum 10, 2146 (2026). https://doi.org/10.22331/q-2026-06-30-2146 We present efficient and practical protocols to measure the second Rényi entropy, whose exponential is known as the purity. Our approach is based on expressing the purity in terms of […]
Quantum 10, 2145 (2026). https://doi.org/10.22331/q-2026-06-30-2145 Recent discoveries in asymptotically good quantum codes have intensified research on their application in quantum computation and fault-tolerant operations. This study focuses on the addressability problem within CSS codes: we […]
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