Quantum 7, 914 (2023). https://doi.org/10.22331/q-2023-02-09-914 We present a method to detect bipartite entanglement based on number-phase-like uncertainty relations in split spin ensembles. First, we derive an uncertainty relation that plays the role of a number-phase […]
Quantum 7, 913 (2023). https://doi.org/10.22331/q-2023-02-02-913 We present substantially generalized and improved quantum algorithms over prior work for inhomogeneous linear and nonlinear ordinary differential equations (ODE). Specifically, we show how the norm of the matrix exponential […]
Quantum 7, 912 (2023). https://doi.org/10.22331/q-2023-02-02-912 TensorCircuit is an open source quantum circuit simulator based on tensor network contraction, designed for speed, flexibility and code efficiency. Written purely in Python, and built on top of industry-standard […]
Quantum 7, 911 (2023). https://doi.org/10.22331/q-2023-02-02-911 The problem of computing the local hidden variable (LHV) value of a Bell inequality plays a central role in the study of quantum nonlocality. In particular, this problem is the […]
Quantum 7, 910 (2023). https://doi.org/10.22331/q-2023-02-02-910 The sign structure of quantum states is closely connected to quantum phases of matter, yet detecting such fine-grained properties of amplitudes is subtle. Here we employ as a diagnostic measurement-induced […]
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 […]
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