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 […]
Quantum 8, 1449 (2024). https://doi.org/10.22331/q-2024-08-27-1449 We consider the task of simulating time evolution under a Hamiltonian $H$ within its low-energy subspace. Assuming access to a block-encoding of $H’:=(H-E)/lambda$, for some $lambda gt 0$ and $E […]
Quantum 8, 1448 (2024). https://doi.org/10.22331/q-2024-08-27-1448 We propose a new model of quantum computation comprised of low-weight measurement sequences that simultaneously encode logical information, enable error correction, and apply logical gates. These measurement sequences constitute a […]
Quantum 8, 1447 (2024). https://doi.org/10.22331/q-2024-08-27-1447 The multitime probability distributions obtained by repeatedly probing a quantum system via the measurement of an observable generally violate Kolmogorov’s consistency property. Therefore, one cannot interpret such distributions as the […]
Quantum 8, 1446 (2024). https://doi.org/10.22331/q-2024-08-27-1446 The survival probability of an initial Coherent Gibbs State (CGS) is a natural extension of the Spectral Form Factor (SFF) to open quantum systems. To quantify the interplay between quantum […]
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