Quantum 9, 1623 (2025). https://doi.org/10.22331/q-2025-02-06-1623 Topological quantum error correction is a milestone in the scaling roadmap of quantum computers, which targets circuits with trillions of gates that would allow running quantum algorithms for real-world problems. […]
Quantum 9, 1622 (2025). https://doi.org/10.22331/q-2025-02-04-1622 A set of pure quantum states is said to be antidistinguishable if upon sampling one at random, there exists a measurement to perfectly determine some state that was not sampled. […]
Quantum 9, 1621 (2025). https://doi.org/10.22331/q-2025-02-04-1621 A unified theoretical approach to describe the properties of multimode squeezed light generated in a lossy medium is presented. This approach is valid for Markovian environments and includes both a […]
Quantum 9, 1620 (2025). https://doi.org/10.22331/q-2025-02-04-1620 The simulation of many-body open quantum systems is key to solving numerous outstanding problems in physics, chemistry, material science, and in the development of quantum technologies. Near-term quantum computers may […]
Quantum 9, 1619 (2025). https://doi.org/10.22331/q-2025-02-04-1619 The quantum Fisher information (QFI) bounds the sensitivity of a quantum measurement, heralding the conditions for quantum advantages when compared with classical strategies. Here, we calculate analytical expressions for the […]
Quantum 9, 1618 (2025). https://doi.org/10.22331/q-2025-01-30-1618 Unlike the surface code, quantum low-density parity-check (QLDPC) codes can have a finite encoding rate, potentially lowering the error correction overhead. However, finite-rate QLDPC codes have nonlocal stabilizers, making it […]
Quantum 9, 1617 (2025). https://doi.org/10.22331/q-2025-01-30-1617 Variational quantum algorithms (VQAs) hold much promise but face the challenge of exponentially small gradients. Unmitigated, this barren plateau (BP) phenomenon leads to an exponential training overhead for VQAs. Perhaps […]
Quantum 9, 1616 (2025). https://doi.org/10.22331/q-2025-01-30-1616 The Page-Wootters formalism is a proposal for reconciling the background-dependent, quantum-mechanical notion of time with the background independence of general relativity. However, the physical meaning of this framework remains debated. […]
Quantum 9, 1615 (2025). https://doi.org/10.22331/q-2025-01-30-1615 Dual-unitary quantum circuits have recently attracted attention as an analytically tractable model of many-body quantum dynamics. Consisting of a 1+1D lattice of 2-qudit gates arranged in a ‘brickwork’ pattern, these […]
Quantum 9, 1614 (2025). https://doi.org/10.22331/q-2025-01-28-1614 Considering a general microscopic model for a quantum measuring apparatus comprising a quantum probe coupled to a thermal bath, we analyze the energetic resources necessary for the realization of a […]
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