On the Entanglement Dynamics of the Quantum Weightless Neuron

Abstract

We investigate the dynamics of the quantum weightless neuron (qRAM) regarding entanglement. Previous works used a quantum extractor operator (QEO) to iterate the qRAM. With the QEO the qRAM output channel can be fed back or iterated despite possible entanglement of the overall output quantum state. Two measures are used here for the quantitative analysis: von Neummann entropy and entanglement entropy. We find that entanglement is disturbed and even increased when the QEO is used. In contrast entanglement stays unchanged under coherent feedback. The results indicate that QEO produces a more diverse dynamics and can be viewed as an environment interaction operator but not with decaying properties. A descriptive analyse of the entropy and entanglement dynamics is presented.