Quantum 9, 1703 (2025). https://doi.org/10.22331/q-2025-04-09-1703 A fundamental step of any quantum algorithm is the preparation of qubit registers in a suitable initial state. Often qubit registers represent a discretization of continuous variables and the initial […]
Quantum 9, 1702 (2025). https://doi.org/10.22331/q-2025-04-09-1702 Entanglement purification and distillation protocols are essential for harnessing the full potential of quantum communication technologies. Multiple strategies have been proposed to approach and optimize such protocols, most however restricted […]
Quantum 9, 1701 (2025). https://doi.org/10.22331/q-2025-04-09-1701 Accurate modeling of noise in realistic quantum processors is critical for constructing fault-tolerant quantum computers. While a full simulation of actual noisy quantum circuits provides information about correlated noise among […]
Quantum 9, 1700 (2025). https://doi.org/10.22331/q-2025-04-09-1700 We introduce a new approach to learn Hamiltonians through a resource that we call the pseudo-Choi state, which encodes the Hamiltonian in a state using a procedure that is analogous […]
Quantum 9, 1699 (2025). https://doi.org/10.22331/q-2025-04-09-1699 Multi-copy activation of genuine multipartite entanglement (GME) is a phenomenon whereby multiple copies of biseparable but fully inseparable states can exhibit GME. This was shown to be generically possible in […]
Quantum 9, 1698 (2025). https://doi.org/10.22331/q-2025-04-08-1698 Classical shadows are a versatile tool to probe many-body quantum systems, consisting of a combination of randomised measurements and classical post-processing computations. In a recently introduced version of the protocol, […]
Quantum 9, 1697 (2025). https://doi.org/10.22331/q-2025-04-08-1697 We study the evolution of a quantum many-body system driven by two competing measurements, which induces a topological entanglement transition between two distinct area law phases. We employ a positive […]
Quantum 9, 1696 (2025). https://doi.org/10.22331/q-2025-04-08-1696 We show how to construct pseudorandom permutations (PRPs) that remain secure even if the adversary can query the permutation, both in the forward and reverse directions, on a quantum superposition […]
Quantum 9, 1695 (2025). https://doi.org/10.22331/q-2025-04-08-1695 Multi-time quantum processes are endowed with the same richness as multipartite states, including temporal entanglement and exotic causal structures. However, experimentally probing these rich phenomena leans heavily on fast and […]
Quantum 9, 1694 (2025). https://doi.org/10.22331/q-2025-04-07-1694 The accurate and efficient energy estimation of quantum Hamiltonians consisting of Pauli observables is an essential task in modern quantum computing. We introduce a Resource-Optimized Grouping Shadow (ROGS) algorithm, which […]
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