Quantum 8, 1472 (2024). https://doi.org/10.22331/q-2024-09-12-1472 Nielsen’s approach to quantum state complexity relates the minimal number of quantum gates required to prepare a state to the length of geodesics computed with a certain norm on the […]
Quantum 8, 1471 (2024). https://doi.org/10.22331/q-2024-09-12-1471 The problem of efficient quantum state learning, also called shadow tomography, aims to comprehend an unknown $d$-dimensional quantum state through POVMs. Yet, these states are rarely static; they evolve due […]
Quantum 8, 1470 (2024). https://doi.org/10.22331/q-2024-09-11-1470 We consider models of quantum computation that involve operations performed on some fixed resourceful quantum state. Examples that fit this paradigm include magic state injection and measurement-based approaches. We introduce […]
Quantum 8, 1469 (2024). https://doi.org/10.22331/q-2024-09-11-1469 Here, we investigate the fractal-lattice Hubbard model using various numerical methods: exact diagonalization, the self-consistent diagonalization of a (mean-field) Hartree-Fock Hamiltonian and state-of-the-art Auxiliary-Field Quantum Monte Carlo. We focus on […]
Quantum 8, 1468 (2024). https://doi.org/10.22331/q-2024-09-11-1468 The code-capacity threshold of a scalable quantum error correcting stabilizer code can be expressed as a thermodynamic phase transition of a corresponding random-bond Ising model. Here we study the XY […]
Quantum 8, 1467 (2024). https://doi.org/10.22331/q-2024-09-11-1467 Classical shadow tomography serves as a potent tool for extracting numerous properties from quantum many-body systems with minimal measurements. Nevertheless, prevailing methods yielding optimal performance for few-body operators necessitate the […]
Quantum 8, 1466 (2024). https://doi.org/10.22331/q-2024-09-09-1466 In lumped-element electrical circuit theory, the problem of solving Maxwell’s equations in the presence of media is reduced to two sets of equations, the constitutive equations encapsulating local geometry and […]
Quantum 8, 1465 (2024). https://doi.org/10.22331/q-2024-09-09-1465 We present an open-source database of superconducting quantum device designs that may be used as the starting point for customized devices. Each design can be generated programmatically using the open-source […]
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 […]
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