Quantum 8, 1486 (2024). https://doi.org/10.22331/q-2024-09-26-1486 Microscopic thermal machines promise to play an important role in future quantum technologies. Making such devices widely applicable will require effective strategies to channel their output into easily accessible storage […]
Quantum 8, 1485 (2024). https://doi.org/10.22331/q-2024-09-26-1485 Nonclassical causal modeling was developed in order to explain violations of Bell inequalities while adhering to relativistic causal structure and $faithfulness$—that is, avoiding fine-tuned causal explanations. Recently, a no-go theorem […]
Quantum 8, 1484 (2024). https://doi.org/10.22331/q-2024-09-25-1484 The training of a parameterized model largely depends on the landscape of the underlying loss function. In particular, vanishing gradients are a central bottleneck in the scalability of variational quantum […]
Quantum 8, 1483 (2024). https://doi.org/10.22331/q-2024-09-25-1483 Understanding the ultimate rate at which information propagates is a pivotal issue in nonequilibrium physics. Nevertheless, the task of elucidating the propagation speed inherent in quantum bosonic systems presents challenges […]
Quantum 8, 1482 (2024). https://doi.org/10.22331/q-2024-09-25-1482 All quantum systems are subject to noise from the environment or external controls. This noise is a major obstacle to the realization of quantum technology. For example, noise limits the […]
Quantum 8, 1481 (2024). https://doi.org/10.22331/q-2024-09-25-1481 The Wigner’s friend experiment is a thought experiment in which a so-called superobserver (Wigner) observes another observer (the friend) who has performed a quantum measurement on a physical system. In […]
Quantum 8, 1480 (2024). https://doi.org/10.22331/q-2024-09-25-1480 Phase estimation plays a central role in communications, sensing, and information processing. Quantum correlated states, such as squeezed states, enable phase estimation beyond the shot-noise limit, and in principle approach […]
Quantum 8, 1479 (2024). https://doi.org/10.22331/q-2024-09-19-1479 In order to substantiate claims of quantum computational advantage, it is crucial to develop efficient methods for validating the experimental data. We propose a test of the correct functioning of […]
Quantum 8, 1478 (2024). https://doi.org/10.22331/q-2024-09-19-1478 Recent advancements in multi-mode Gottesman-Kitaev-Preskill (GKP) codes have shown great promise in enhancing the protection of both discrete and analog quantum information. This broadened range of protection brings opportunities beyond […]
Quantum 8, 1477 (2024). https://doi.org/10.22331/q-2024-09-19-1477 Quantum Krylov subspace diagonalization (QKSD) is an emerging method used in place of quantum phase estimation in the early fault-tolerant era, where limited quantum circuit depth is available. In contrast […]
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