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 […]
Quantum 6, 849 (2022). https://doi.org/10.22331/q-2022-11-03-849 Effect algebras were introduced as an abstract algebraic model for Hilbert space effects representing quantum mechanical measurements. We study additional structures on an effect algebra $E$ that enable us to […]
Quantum 6, 848 (2022). https://doi.org/10.22331/q-2022-11-03-848 Preparing macroscopic mechanical resonators close to their motional quantum groundstate and generating entanglement with light offers great opportunities in studying fundamental physics and in developing a new generation of quantum […]
Quantum 6, 847 (2022). https://doi.org/10.22331/q-2022-10-25-847 Tracing out the environmental degrees of freedom is a necessary procedure when simulating open quantum systems. While being an essential step in deriving a tractable master equation it represents a […]
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