Quantum 9, 1855 (2025). https://doi.org/10.22331/q-2025-09-11-1855 Highly correlated biphoton states are powerful resources in quantum optics, both for fundamental tests of the theory and practical applications. In particular, high-dimensional spatial correlation has been used in several […]
Quantum 9, 1854 (2025). https://doi.org/10.22331/q-2025-09-11-1854 We consider the extent to which a Trotterized time evolution implemented on a quantum computer is altered by the presence of decoherence. Given a specific set of assumptions regarding the […]
Quantum 9, 1853 (2025). https://doi.org/10.22331/q-2025-09-11-1853 $sf{StoqMA}$ characterizes the computational hardness of stoquastic local Hamiltonians, which is a family of Hamiltonians that does not suffer from the sign problem. Although error reduction is commonplace for many […]
Quantum 9, 1852 (2025). https://doi.org/10.22331/q-2025-09-08-1852 We propose a systematic framework to construct a $(d+1)$-dimensional stabilizer model from an initial generic d-dimensional abelian symmetry. Our approach builds upon the iterative gauging procedure, developed by one of […]
Quantum 9, 1851 (2025). https://doi.org/10.22331/q-2025-09-05-1851 Local Friendliness (LF) inequalities follow from seemingly reasonable assumptions about reality: (i) “absoluteness of observed events” (e.g., every observed event happens for all observers) and (ii) “local agency” (e.g., free […]
Quantum 9, 1850 (2025). https://doi.org/10.22331/q-2025-09-05-1850 We study simultaneous symmetry breaking in spontaneous Floquet states, focusing on the specific case of an atomic condensate. We first describe the quantization of the Nambu-Goldstone (NG) modes for a […]
Quantum 9, 1849 (2025). https://doi.org/10.22331/q-2025-09-05-1849 A central goal in quantum error correction is to reduce the overhead of fault-tolerant quantum computing by increasing noise thresholds and reducing the number of physical qubits required to sustain […]
Quantum 9, 1848 (2025). https://doi.org/10.22331/q-2025-09-05-1848 Randomized benchmarking (RB) protocols are widely used to measure an average error rate for a set of quantum logic gates. However, the standard version of RB is limited because it […]
Quantum 9, 1847 (2025). https://doi.org/10.22331/q-2025-09-03-1847 In this work, we highlight an unforeseen behavior of the expressivity of Parameterized Quantum Circuits (PQCs) for machine learning. A large class of these models, seen as Fourier series whose […]
Quantum 9, 1846 (2025). https://doi.org/10.22331/q-2025-09-03-1846 Code switching is an established technique that facilitates a universal set of FT quantum gate operations by combining two QEC codes with complementary sets of gates, which each by themselves […]
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