1,089 research outputs found
On the correction of anomalous phase oscillation in entanglement witnesses using quantum neural networks
Entanglement of a quantum system depends upon relative phase in complicated
ways, which no single measurement can reflect. Because of this, entanglement
witnesses are necessarily limited in applicability and/or utility. We propose
here a solution to the problem using quantum neural networks. A quantum system
contains the information of its entanglement; thus, if we are clever, we can
extract that information efficiently. As proof of concept, we show how this can
be done for the case of pure states of a two-qubit system, using an
entanglement indicator corrected for the anomalous phase oscillation. Both the
entanglement indicator and the phase correction are calculated by the quantum
system itself acting as a neural network
A quantum neural network computes its own relative phase
Complete characterization of the state of a quantum system made up of
subsystems requires determination of relative phase, because of interference
effects between the subsystems. For a system of qubits used as a quantum
computer this is especially vital, because the entanglement, which is the basis
for the quantum advantage in computing, depends intricately on phase. We
present here a first step towards that determination, in which we use a
two-qubit quantum system as a quantum neural network, which is trained to
compute and output its own relative phase
Verbena brasiliensis Vell.
https://thekeep.eiu.edu/herbarium_specimens_byname/19329/thumbnail.jp
Verbena brasiliensis Vell.
https://thekeep.eiu.edu/herbarium_specimens_byname/19329/thumbnail.jp
Verbena tenuisecta Briq.
https://thekeep.eiu.edu/herbarium_specimens_byname/19379/thumbnail.jp
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