Quantum 8, 1442 (2024). https://doi.org/10.22331/q-2024-08-16-1442 Convex functions of quantum states play a key role in quantum physics, with examples ranging from Bell inequalities to von Neumann entropy. However, in experimental scenarios, direct measurements of these […]
Quantum 8, 1441 (2024). https://doi.org/10.22331/q-2024-08-14-1441 Virtual distillation has been proposed as an error mitigation protocol for estimating the expectation values of observables in quantum algorithms. It proceeds by creating a cyclic permutation of $M$ noisy […]
Quantum 8, 1440 (2024). https://doi.org/10.22331/q-2024-08-14-1440 Since their first introduction, Quantum Reference Frame (QRF) transformations have been extensively discussed, generalising the covariance of physical laws to the quantum domain. Despite important progress, a formulation of QRF […]
Quantum 8, 1439 (2024). https://doi.org/10.22331/q-2024-08-14-1439 We discuss families of approximate quantum error correcting codes which arise as the nearly-degenerate ground states of certain quantum many-body Hamiltonians composed of non-commuting terms. For exact codes, the conditions […]
Quantum 8, 1438 (2024). https://doi.org/10.22331/q-2024-08-13-1438 The Krylov subspace methods, being one category of the most important classical numerical methods for linear algebra problems, can be much more powerful when generalised to quantum computing. However, quantum […]
Quantum 8, 1437 (2024). https://doi.org/10.22331/q-2024-08-13-1437 Assessment of practical quantum information processing (QIP) remains partial without understanding limits imposed by noise. Unfortunately, mere description of noise grows exponentially with system size, becoming cumbersome even for modest […]
Quantum 8, 1436 (2024). https://doi.org/10.22331/q-2024-08-12-1436 With the advent of quantum technology, the interest in communication tasks assisted by quantum systems has increased both in academia and industry. Nonetheless, the transmission of a quantum state in […]
Quantum 8, 1435 (2024). https://doi.org/10.22331/q-2024-08-08-1435 Measurement-device-independent quantum key distribution (MDI-QKD) closes all the security loopholes in the detection system and is a promising solution for secret key sharing. Polarization encoding is the most common QKD […]
Quantum 8, 1434 (2024). https://doi.org/10.22331/q-2024-08-08-1434 The Hayden-Preskill protocol probes the capability of information recovery from local subsystems after unitary dynamics. As such it resolves the capability of quantum many-body systems to dynamically implement a quantum […]
Quantum 8, 1433 (2024). https://doi.org/10.22331/q-2024-08-08-1433 We consider the tasks of learning quantum states, measurements and channels generated by continuous-variable (CV) quantum circuits. This family of circuits is suited to describe optical quantum technologies and in […]
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