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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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Quantum Entanglement from Classical Trajectories.

Johan E Runeson¹, Jeremy O Richardson¹

¹Laboratory of Physical Chemistry, ETH Zürich, 8093 Zürich, Switzerland.

Physical Review Letters

|January 14, 2022

Summary

This summary is machine-generated.

Researchers developed a new method for quantum-classical simulations, describing entanglement using independent classical trajectories. This approach accurately models quantum effects like coherence and decoherence in complex systems.

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Area of Science:

Quantum Mechanics
Computational Chemistry
Chemical Physics

Background:

Mixed quantum-classical (MQC) simulations face challenges in accurately treating entanglement.
Existing methods like surface-hopping or semiclassical approaches have limitations.

Purpose of the Study:

To present a novel approach for MQC simulations that describes entanglement using classical trajectories.
To offer an alternative to existing simulation methods.

Main Methods:

Developed a novel approach based on independent and deterministic Ehrenfest-like classical trajectories.
Mapped a two-level quantum system in a classical environment to a path-integral representation of a spin 1/2.

Main Results:

The method successfully describes the emergence of entangled states.
It accurately accounts for quantum coherence and decoherence.
Reproduces wave packet splitting in nonadiabatic scattering problems.

Conclusions:

The novel approach provides a new class of simulations for MQC systems.
It offers a deterministic alternative to stochastic or coupled-trajectory methods.
This method enhances the simulation of quantum phenomena in classical environments.