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 […]
Quantum 8, 1454 (2024). https://doi.org/10.22331/q-2024-08-29-1454 Most quantum theorists are familiar with different ways of describing the effective quantum dynamics of a system coupled to external degrees of freedom, such as the Born-Markov master equation or […]
Quantum 8, 1453 (2024). https://doi.org/10.22331/q-2024-08-28-1453 $tt{GraphiQ}$ is a versatile open-source framework for designing photonic graph state generation schemes, with a particular emphasis on photon-emitter hybrid circuits. Built in Python, GraphiQ consists of a suite of […]
Quantum 8, 1452 (2024). https://doi.org/10.22331/q-2024-08-28-1452 A source assumed to prepare a specified reference state sometimes prepares an anomalous one. We address the task of identifying these anomalous states in a series of $n$ preparations with […]
Quantum 8, 1451 (2024). https://doi.org/10.22331/q-2024-08-28-1451 Quadratic programming over orthogonal matrices encompasses a broad class of hard optimization problems that do not have an efficient quantum representation. Such problems are instances of the little noncommutative Grothendieck […]
Quantum 8, 1450 (2024). https://doi.org/10.22331/q-2024-08-27-1450 We propose a decoder for the correction of erasures with hypergraph product codes, which form one of the most popular families of quantum LDPC codes. Our numerical simulations show that […]
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