Quantum 6, 859 (2022). https://doi.org/10.22331/q-2022-11-14-859 Invariance under Lorentz transformations is fundamental to both the standard model and general relativity. Testing Lorentz-symmetry violation (LSV) via atomic systems attracts extensive interests in both theory and experiment. In […]
Quantum 6, 858 (2022). https://doi.org/10.22331/q-2022-11-10-858 I show that if a finite-dimensional density matrix has strictly smaller von Neumann entropy than a second one of the same dimension (and the rank is not bigger), then sufficiently […]
Quantum 6, 857 (2022). https://doi.org/10.22331/q-2022-11-10-857 In this letter, we propose how to measure the quantized nonlinear transport using two-dimensional ultracold atomic Fermi gases in a harmonic trap. This scheme requires successively applying two optical pulses […]
Quantum 6, 856 (2022). https://doi.org/10.22331/q-2022-11-10-856 We systematically investigate the robustness of symmetry protected topological (SPT) order in open quantum systems by studying the evolution of string order parameters and other probes under noisy channels. We […]
Quantum 6, 855 (2022). https://doi.org/10.22331/q-2022-11-10-855 Even after decades of quantum computing development, examples of generally useful quantum algorithms with exponential speedups over classical counterparts are scarce. Recent progress in quantum algorithms for linear-algebra positioned quantum […]
Quantum 6, 854 (2022). https://doi.org/10.22331/q-2022-11-10-854 We put forward a simple construction of genuinely entangled subspaces – subspaces supporting only genuinely multipartite entangled states – of any permissible dimensionality for any number of parties and local […]
Quantum 6, 853 (2022). https://doi.org/10.22331/q-2022-11-10-853 We study the partially ordered set of equivalence classes of quantum measurements endowed with the post-processing partial order. The post-processing order is fundamental as it enables to compare measurements by […]
Quantum 6, 852 (2022). https://doi.org/10.22331/q-2022-11-03-852 Quantum chaos cannot develop faster than $lambda leq 2 pi/(hbar beta)$ for systems in thermal equilibrium [Maldacena, Shenker & Stanford, JHEP (2016)]. This `MSS bound’ on the Lyapunov exponent $lambda$ […]
Quantum 6, 851 (2022). https://doi.org/10.22331/q-2022-11-03-851 In this work, the concept of mutually unbiased frames is introduced as the most general notion of unbiasedness for sets composed by linearly independent and normalized vectors. It encompasses the […]
Quantum 6, 850 (2022). https://doi.org/10.22331/q-2022-11-03-850 Symmetric quantum signal processing provides a parameterized representation of a real polynomial, which can be translated into an efficient quantum circuit for performing a wide range of computational tasks on […]
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