Quantum 7, 1042 (2023). https://doi.org/10.22331/q-2023-06-21-1042 We study the phenomenon of cosmological particle production of Dirac fermions in a Friedmann-Robertson-Walker spacetime, focusing on a $(1+1)-$dimensional case in which the evolution of the scale factor is set […]
Quantum 7, 1041 (2023). https://doi.org/10.22331/q-2023-06-12-1041 We consider a class of translation-invariant 2D tensor network states with a stabilizer symmetry, which we call stabilizer PEPS. The cluster state, GHZ state, and states in the toric code […]
Quantum 7, 1040 (2023). https://doi.org/10.22331/q-2023-06-12-1040 Quantum simulation of strongly correlated systems is potentially the most feasible useful application of near-term quantum computers. Minimizing quantum computational resources is crucial to achieving this goal. A promising class […]
Quantum 7, 1039 (2023). https://doi.org/10.22331/q-2023-06-12-1039 In adiabatic quantum computing finding the dependence of the gap of the Hamiltonian as a function of the parameter varied during the adiabatic sweep is crucial in order to optimize […]
Quantum 7, 1038 (2023). https://doi.org/10.22331/q-2023-06-07-1038 Quantum correlations and Wigner negativity are two important signatures of nonclassicality in continuous-variable quantum systems. In this work, we investigate how both are intertwined in the context of the conditional […]
Quantum 7, 1037 (2023). https://doi.org/10.22331/q-2023-06-07-1037 Belief propagation (BP) is well-known as a low complexity decoding algorithm with a strong performance for important classes of quantum error correcting codes, e.g. notably for the quantum low-density parity […]
Quantum 7, 1036 (2023). https://doi.org/10.22331/q-2023-06-07-1036 Given a dataset of input states, measurements, and probabilities, is it possible to efficiently predict the measurement probabilities associated with a quantum circuit? Recent work of Caro and Datta (2020) […]
Quantum 7, 1035 (2023). https://doi.org/10.22331/q-2023-06-07-1035 While there is general consensus on the definition of incompatible POVMs, moving up to the level of instruments one finds a much less clear situation, with mathematically different and logically […]
Quantum 7, 1034 (2023). https://doi.org/10.22331/q-2023-06-06-1034 Error mitigation is an essential component of achieving a practical quantum advantage in the near term, and a number of different approaches have been proposed. In this work, we recognize […]
Quantum 7, 1033 (2023). https://doi.org/10.22331/q-2023-06-05-1033 Measurement error and disturbance, in the presence of conservation laws, are analysed in general operational terms. We provide novel quantitative bounds demonstrating necessary conditions under which accurate or non-disturbing measurements […]
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