How long does entanglement last?

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SUMMARY

Entangled photons, generated through processes such as Spontaneous Parametric Down-Conversion (SPDC) or quantum dots, exhibit varying durations of entanglement influenced by environmental noise and interactions. Recent studies indicate that by employing dissipative mechanisms alongside continuous measurement, steady-state entanglement can be maintained for up to one hour. The research titled "Entanglement Generated by Dissipation and Steady State Entanglement of Two Macroscopic Objects" provides detailed insights into these findings, emphasizing the challenges posed by external factors in sustaining entanglement.

PREREQUISITES
  • Understanding of Spontaneous Parametric Down-Conversion (SPDC)
  • Familiarity with quantum dots and their role in photon entanglement
  • Knowledge of dissipative mechanisms in quantum systems
  • Concept of continuous measurement in quantum mechanics
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  • Research the implications of environmental noise on quantum entanglement
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  • Study the full article "Entanglement Generated by Dissipation and Steady State Entanglement of Two Macroscopic Objects" for in-depth analysis
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Quantum physicists, researchers in quantum information science, and anyone interested in the practical applications of quantum entanglement and its stability in various environments.

San K
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once entangled photons are created (via say SPDC or quantum dots etc) ...how long does the entanglement last?

there is so much noise in the environment
so many things the entangled photons would interact with,
so many ways to transfer/exchange momentum with the surroundings
 
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I'm not sure if someone has recorded longer than this for this size objects?
By combining the dissipative mechanism with a continuous measurement, steady state entanglement is continuously generated and observed for up to an hour.
Entanglement Generated by Dissipation and Steady State Entanglement of Two Macroscopic Objects
http://prl.aps.org/abstract/PRL/v107/i8/e080503
http://lanl.arxiv.org/pdf/1006.4344.pdf (full article pre-print)
 
Last edited:
San K said:
once entangled photons are created (via say SPDC or quantum dots etc) ...how long does the entanglement last?

there is so much noise in the environment
so many things the entangled photons would interact with,
so many ways to transfer/exchange momentum with the surroundings

You've more or less answered your own question: entanglement lasts as long as you can effectively mitigate those external factors. The larger the system is, the more difficult this is to do for extended periods.
 

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