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Updated: Jun 5, 2026

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

Entanglement dynamics in open two-qubit systems via diffusive quantum trajectories.

Carlos Viviescas¹, Ivonne Guevara, André R R Carvalho

¹Departamento de Física, Universidad Nacional de Colombia, Carrera 30 No. 45-03 Edificio 404, Bogotá D.C., Colombia.

Physical Review Letters

|January 15, 2011

Summary

This summary is machine-generated.

Researchers characterized two-qubit entanglement evolution under spontaneous emission using optimal continuous monitoring. This method determines entanglement dynamics and disentanglement time from single quantum trajectories.

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Last Updated: Jun 5, 2026

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

Area of Science:

Quantum information science
Quantum optics
Atomic physics

Background:

Spontaneous emission leads to decoherence and entanglement decay in quantum systems.
Characterizing entanglement dynamics is crucial for quantum information processing.
Continuous monitoring offers a way to track quantum states over time.

Purpose of the Study:

To fully characterize the time evolution of two-qubit entanglement under spontaneous emission.
To analytically determine the optimal continuous monitoring strategy (unraveling).
To derive a deterministic equation for concurrence evolution.

Main Methods:

Utilizing quantum diffusive trajectories.
Analytically deriving the optimal unraveling for continuous monitoring.
Developing a deterministic evolution equation for concurrence.

Main Results:

Demonstrated that optimal continuous monitoring fully characterizes entanglement time evolution.
Derived the specific optimal unraveling for spontaneous emission.
Obtained a deterministic equation describing concurrence decay.

Conclusions:

Optimal continuous monitoring provides a complete description of entanglement dynamics under decoherence.
The derived methods allow for precise determination of disentanglement time from single trajectories.
Proposed experimental feasibility for monitoring entanglement in bipartite systems.