Quantum 10, 2158 (2026). https://doi.org/10.22331/q-2026-07-15-2158 The Quantum Approximate Optimisation Algorithm (QAOA) tackles combinatorial optimisation problems by encoding their solutions into the ground state of an Ising Hamiltonian prepared by a $p$-level parameterised circuit, with the […]
Quantum 10, 2157 (2026). https://doi.org/10.22331/q-2026-07-08-2157 Uncloneable encryption is a cryptographic primitive which encrypts a classical message into a quantum ciphertext, such that two quantum adversaries are limited in their capacity of being able to simultaneously […]
Quantum 10, 2156 (2026). https://doi.org/10.22331/q-2026-07-08-2156 Encoding a qubit in a larger Hilbert space of an oscillator is an efficient way to protect its quantum information against decoherence. Promising examples of such bosonic encodings are the […]
Quantum 10, 2155 (2026). https://doi.org/10.22331/q-2026-07-08-2155 In continuous-variable quantum computation, identifying key elements that enable a quantum computational advantage is a long-standing issue. Starting from the standard results on the necessity of Wigner negativity, we develop […]
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 […]
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