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 […]
Quantum 9, 1693 (2025). https://doi.org/10.22331/q-2025-04-07-1693 Spatially-coupled (SC) codes is a class of convolutional LDPC codes that has been well investigated in classical coding theory thanks to their high performance and compatibility with low-latency decoders. We […]
Quantum 9, 1692 (2025). https://doi.org/10.22331/q-2025-04-07-1692 The dynamics of monitored systems can exhibit a measurement-induced phase transition (MIPT) between entangling and disentangling phases, tuned by the measurement rate. When the dynamics obeys a continuous symmetry, the […]
Quantum 9, 1691 (2025). https://doi.org/10.22331/q-2025-04-07-1691 Quantum money is the task of verifying the validity of banknotes while ensuring that they cannot be counterfeited. Public-key quantum money allows anyone to perform verification, while the private-key setting […]
Quantum 9, 1690 (2025). https://doi.org/10.22331/q-2025-04-07-1690 High-dimensional quantum computing has generated significant interest due to its potential to address scalability and error correction challenges faced by traditional qubit-based systems. This paper investigates the Average Gate Fidelity […]
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