Quantum 8, 1464 (2024). https://doi.org/10.22331/q-2024-09-09-1464 What would be the consequences if there were fundamental limits to our ability to experimentally explore the world? In this work we seriously consider this question. We assume the existence […]
Quantum 8, 1463 (2024). https://doi.org/10.22331/q-2024-09-09-1463 Quantum-enhanced (i.e., higher performance by quantum effects than any classical methods) mean value estimation of observables is a fundamental task in various quantum technologies; in particular, it is an essential […]
Quantum 8, 1462 (2024). https://doi.org/10.22331/q-2024-09-06-1462 In this work, we explore the interplay of confinement, string breaking and entanglement asymmetry on a 1D quantum Ising chain. We consider the evolution of an initial domain wall and […]
Quantum 8, 1461 (2024). https://doi.org/10.22331/q-2024-09-05-1461 The nonstabilizerness, or magic, is an essential quantum resource to perform universal quantum computation. Robustness of magic (RoM) in particular characterizes the degree of usefulness of a given quantum state […]
Quantum 8, 1460 (2024). https://doi.org/10.22331/q-2024-09-04-1460 We numerically analyze the feasibility of a platform-neutral, general strategy to perform quantum simulations of fermionic lattice field theories under open boundary conditions. The digital quantum simulator requires solely one- […]
Quantum 8, 1459 (2024). https://doi.org/10.22331/q-2024-09-03-1459 In this paper we introduce and investigate the concept of a $textit{perfect quantum protractor}$, a pure quantum state $|psirangleinmathcal{H}$ that generates three different orthogonal bases of $mathcal{H}$ under rotations around […]
Quantum 8, 1458 (2024). https://doi.org/10.22331/q-2024-09-03-1458 Quantum networks crucially rely on the availability of high-quality entangled pairs of qubits, known as entangled links, distributed across distant nodes. Maintaining the quality of these links is a challenging […]
Quantum 8, 1457 (2024). https://doi.org/10.22331/q-2024-08-29-1457 This work provides a nonasymptotic error analysis of quantum Krylov algorithms based on real-time evolutions, subject to generic errors in the outputs of the quantum circuits. We prove upper and […]
Quantum 8, 1456 (2024). https://doi.org/10.22331/q-2024-08-29-1456 Quantum state designs, by enabling an efficient sampling of random quantum states, play a quintessential role in devising and benchmarking various quantum protocols with broad applications ranging from circuit designs […]
Quantum 8, 1455 (2024). https://doi.org/10.22331/q-2024-08-29-1455 Classical shadows (CS) offer a resource-efficient means to estimate quantum observables, circumventing the need for exhaustive state tomography. Here, we clarify and explore the connection between CS techniques and least […]
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