Quantum 7, 909 (2023). https://doi.org/10.22331/q-2023-01-26-909 We introduce a variational quantum algorithm to solve unconstrained black box binary optimization problems, i.e., problems in which the objective function is given as black box. This is in contrast […]
Quantum 7, 908 (2023). https://doi.org/10.22331/q-2023-01-26-908 This work studies pulse based variational quantum algorithms (VQAs), which are designed to determine the ground state of a quantum mechanical system by combining classical and quantum hardware. In contrast […]
Quantum 7, 907 (2023). https://doi.org/10.22331/q-2023-01-26-907 We investigate nonlocal quantum correlations arising between multiple two-level impurity atoms coupled to an ultracold bosonic gas. We find that the environment-induced dynamics of the impurity subsystem can generate nonlocal […]
Quantum 7, 906 (2023). https://doi.org/10.22331/q-2023-01-26-906 The accurate estimation of quantum observables is a critical task in science. With progress on the hardware, measuring a quantum system will become increasingly demanding, particularly for variational protocols that […]
Quantum 7, 905 (2023). https://doi.org/10.22331/q-2023-01-26-905 Learning the unknown Hamiltonian governing the dynamics of a quantum many-body system is a challenging task. In this manuscript, we propose a possible strategy based on repeated measurements on a […]
Quantum 7, 904 (2023). https://doi.org/10.22331/q-2023-01-24-904 We consider a system of multiple qubits without any quantum control. We show that one can mediate entanglement between different subsystems in a controlled way by adding a (locally) controlled […]
Quantum 7, 903 (2023). https://doi.org/10.22331/q-2023-01-19-903 Qubit memory that is entangled with photonic qubit is the building block for long distance quantum repeaters. Cavity enhanced and long lived spin wave photon entanglement has been demonstrated by […]
Quantum 7, 902 (2023). https://doi.org/10.22331/q-2023-01-19-902 We introduce a new set of quantum channels: resonant multilevel amplitude damping (ReMAD) channels. Among other instances, they can describe energy dissipation effects in multilevel atomic systems induced by the […]
Quantum 7, 901 (2023). https://doi.org/10.22331/q-2023-01-19-901 The fisherman caught a quantum fish. “Fisherman, please let me go”, begged the fish, “and I will grant you three wishes”. The fisherman agreed. The fish gave the fisherman a […]
Quantum 7, 900 (2023). https://doi.org/10.22331/q-2023-01-19-900 The Kochen–Specker (KS) theorem reveals the nonclassicality of single quantum systems. In contrast, Bell’s theorem and entanglement concern the nonclassicality of composite quantum systems. Accordingly, unlike incompatibility, entanglement and Bell […]
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