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 […]
Quantum 8, 1476 (2024). https://doi.org/10.22331/q-2024-09-19-1476 In this paper, we propose a novel bipartite entanglement purification protocol built upon hashing and upon the guessing random additive noise decoding (GRAND) approach recently devised for classical error correction […]
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