64,288 research outputs found
Quantum simulation of topological Majorana bound states and their universal quantum operations using charge-qubit arrays
Majorana bound states have been a focus of condensed matter research for
their potential applications in topological quantum computation. Here we
utilize two charge-qubit arrays to explicitly simulate a DIII class
one-dimensional superconductor model where Majorana end states can appear.
Combined with one braiding operation, universal single-qubit operations on a
Majorana-based qubit can be implemented by a controllable inductive coupling
between two charge qubits at the ends of the arrays. We further show that in a
similar way, a controlled-NOT gate for two topological qubits can be simulated
in four charge-qubit arrays. Although the current scheme may not truly realize
topological quantum operations, we elaborate that the operations in
charge-qubit arrays are indeed robust against certain local perturbations.Comment: 5 pages, 3 figure
Understanding Polarization Correlation of Entangled Vector Meson Pairs
We propose an experimental test of local hidden variable theories against
quantum mechanics by measuring the polarization correlation of entangled vector
meson pairs. In our study, the form of the polarization correlation probability
is reproduced in a natural way by interpreting the two-body decay of the meson
as a measurement of its polarization vector within the framework of quantum
mechanics. This provides more detailed information on the quantum entanglement,
thus a new Monte Carlo method to simulate the quantum correlation is
introduced. We discuss the feasibility of carrying out such a test at
experiments in operation currently and expect that the measured correlated
distribution may provide us with deeper insight into the fundamental question
about locality and reality.Comment: 7 pages, 3 figures. v3: The version published in PR
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