Quantum 9, 1655 (2025). https://doi.org/10.22331/q-2025-03-06-1655 The estimation of many-qubit observables is an essential task of quantum information processing. The generally applicable approach is to decompose the observables into weighted sums of multi-qubit Pauli strings, i.e., […]
Quantum 9, 1654 (2025). https://doi.org/10.22331/q-2025-03-06-1654 Device-independent (DI) quantum cryptography aims at providing secure cryptography with minimal trust in, or characterisation of, the underlying quantum devices. A key step in DI protocols is randomness extraction (or […]
Quantum 9, 1653 (2025). https://doi.org/10.22331/q-2025-03-05-1653 We consider an infinite-range interacting quantum spin-1/2 model, undergoing periodic kicking and dissipatively coupled with an environment. In the thermodynamic limit, it is described by classical mean-field equations that can […]
Quantum 9, 1652 (2025). https://doi.org/10.22331/q-2025-03-05-1652 We analyse two party non-local games whose predicate requires Alice and Bob to generate matching bits, and their three party extensions where a third player receives all inputs and is […]
Quantum 9, 1651 (2025). https://doi.org/10.22331/q-2025-02-26-1651 A key conjecture about the evolution of complex quantum systems towards an ergodic steady state, known as scrambling, is that this process acquires universal features when it is most efficient. […]
Quantum 9, 1650 (2025). https://doi.org/10.22331/q-2025-02-26-1650 The fascinating concept of coherent quantum absorber – which can absorb any photon emitted by another system while maintaining entanglement with that system – has found diverse implications in open […]
Quantum 9, 1649 (2025). https://doi.org/10.22331/q-2025-02-26-1649 The matrix rank and its positive versions are robust for small approximations, i.e. they do not decrease under small perturbations. In contrast, the multipartite tensor rank can collapse for arbitrarily […]
Quantum 9, 1648 (2025). https://doi.org/10.22331/q-2025-02-26-1648 We study Heisenberg scaling of quantum metrology in the viewpoint of population coding. Although Fisher information has been used for a figure of merit to characterize Heisenberg scaling in quantum […]
Quantum 9, 1647 (2025). https://doi.org/10.22331/q-2025-02-26-1647 In this paper we study single qutrit circuits consisting of words over the Clifford$+mathcal{D}$ cyclotomic gate set, where $mathcal{D}=text{diag}(pmxi^{a},pmxi^{b},pmxi^{c})$, $xi$ is a primitive $9$-th root of unity and $a,b,c$ are […]
Quantum 9, 1646 (2025). https://doi.org/10.22331/q-2025-02-26-1646 Quantum non-Markovianity in tripartite quantum states $rho_{ABC}$ represents a correlation between systems $A$ and $C$ when conditioned on the system $B$ and is known to have both classical and quantum […]
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