Quantum 6, 883 (2022). https://doi.org/10.22331/q-2022-12-22-883 Equivalent approaches to determine eigenfrequencies of the Liouvillians of open quantum systems are discussed using the solution of the Heisenberg-Langevin equations and the corresponding equations for operator moments. A simple […]
Quantum 6, 882 (2022). https://doi.org/10.22331/q-2022-12-22-882 This paper is concerned with complexity theoretic aspects of a general formulation of quantum game theory that models strategic interactions among rational agents that process and exchange quantum information. In […]
Quantum 6, 881 (2022). https://doi.org/10.22331/q-2022-12-22-881 Quantum machine learning techniques have been proposed as a way to potentially enhance performance in machine learning applications. In this paper, we introduce two new quantum methods for neural networks. […]
Quantum 6, 880 (2022). https://doi.org/10.22331/q-2022-12-22-880 The security of finite-length keys is essential for the implementation of device-independent quantum key distribution (DIQKD). Presently, there are several finite-size DIQKD security proofs, but they are mostly focused on […]
Quantum 6, 879 (2022). https://doi.org/10.22331/q-2022-12-19-879 The effective quantum field theory description of gravity, despite its non-renormalizability, allows for predictions beyond classical general relativity. As we enter the age of gravitational wave astronomy, an important and […]
Quantum 6, 878 (2022). https://doi.org/10.22331/q-2022-12-19-878 Realizations of gauge theories in setups of quantum synthetic matter open up the possibility of probing salient exotic phenomena in condensed matter and high-energy physics, along with potential applications in […]
Quantum 6, 877 (2022). https://doi.org/10.22331/q-2022-12-19-877 The permanent is pivotal to both complexity theory and combinatorics. In quantum computing, the permanent appears in the expression of output amplitudes of linear optical computations, such as in the […]
Quantum 6, 876 (2022). https://doi.org/10.22331/q-2022-12-13-876 Many quantum algorithms for numerical linear algebra assume black-box access to a block-encoding of the matrix of interest, which is a strong assumption when the matrix is not sparse. Kernel […]
Quantum 6, 875 (2022). https://doi.org/10.22331/q-2022-12-13-875 Here we argue that the probability that a given source produces exactly a single photon is a natural quantity to benchmark single-photon sources as it certifies the absence of multi-photon […]
Quantum 6, 874 (2022). https://doi.org/10.22331/q-2022-12-13-874 We introduce a hybrid quantum-classical variational algorithm to simulate ground-state phase diagrams of frustrated quantum spin models in the thermodynamic limit. The method is based on a cluster-Gutzwiller ansatz where […]
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