Quantum 9, 1825 (2025). https://doi.org/10.22331/q-2025-08-08-1825 The rapid advancement of quantum hardware necessitates the development of reliable methods to certify its correct functioning. However, existing certification tests fall short, as they either suffer from systematic errors […]
Quantum 9, 1824 (2025). https://doi.org/10.22331/q-2025-08-08-1824 We present a theoretical proposal for preparing and manipulating a state of a single continuous-variable degree of freedom confined to a nonharmonic potential. By utilizing optimally controlled modulation of the […]
Quantum 9, 1823 (2025). https://doi.org/10.22331/q-2025-08-07-1823 The hybrid tensor network (HTN) method is a general framework allowing for the construction of an effective wavefunction with the combination of classical tensors and quantum tensors, i.e., amplitudes of […]
Quantum 9, 1822 (2025). https://doi.org/10.22331/q-2025-08-07-1822 Response theory has a successful history of connecting experimental observations with theoretical predictions. Of particular interest is the optical response of matter, from which spectroscopy experiments can be modelled. However, […]
Quantum 9, 1821 (2025). https://doi.org/10.22331/q-2025-08-05-1821 In the absence of fault tolerant quantum error correction for analog, Hamiltonian quantum computation, error suppression via energy penalties is an effective alternative. We construct families of distance-$2$ stabilizer subsystem […]
Quantum 9, 1820 (2025). https://doi.org/10.22331/q-2025-08-04-1820 We investigate the emergence of stable subspaces in the low-temperature quantum thermal dynamics of finite spin chains. Our analysis reveals the existence of effective decoherence-free qudit subspaces, persisting for timescales […]
Quantum 9, 1819 (2025). https://doi.org/10.22331/q-2025-07-31-1819 The Local Friendliness argument is an extended Wigner’s friend no-go theorem that provides strong constraints on the nature of reality – stronger even than those imposed by Bell’s theorem or […]
Quantum 9, 1818 (2025). https://doi.org/10.22331/q-2025-07-30-1818 Embezzlement of entanglement refers to the task of extracting entanglement from an entanglement resource via local operations and without communication while perturbing the resource arbitrarily little. Recently, the existence of […]
Quantum 9, 1817 (2025). https://doi.org/10.22331/q-2025-07-30-1817 We propose several algorithms for learning unitary operators from quantum statistical queries with respect to their Choi-Jamiolkowski state. Quantum statistical queries capture the capabilities of a learner with limited quantum […]
Quantum 9, 1816 (2025). https://doi.org/10.22331/q-2025-07-29-1816 We introduce “dual-unitary shadow tomography” (DUST), a classical shadow tomography protocol based on dual-unitary brick-wall circuits. To quantify the performance of DUST, we study operator spreading and Pauli weight dynamics […]
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