How long does entanglement last?

However, by combining dissipative mechanisms and continuous measurement, steady state entanglement has been successfully observed for up to an hour for two macroscopic objects. This was demonstrated in the article "Entanglement Generated by Dissipation and Steady State Entanglement of Two Macroscopic Objects" (http://prl.aps.org/abstract/PRL/v107/i8/e080503) and further discussed in the pre-print of the full article (http://lanl.arxiv.org/pdf/1006.4344.pdf). In summary, the duration of entanglement is dependent on the external factors and can be extended through certain techniques.
  • #1
San K
911
1
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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  • #2
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:
  • #3
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.
 

1. How do you measure the duration of entanglement?

The duration of entanglement is typically measured by the time it takes for the entangled particles to become disentangled. This can be done by observing the particles and measuring the time it takes for them to return to their original state.

2. Can entanglement last forever?

There is currently no evidence to suggest that entanglement can last forever. The duration of entanglement is affected by various factors such as environmental noise and interactions with other particles, which can cause the entanglement to decay over time.

3. How long does entanglement last in a controlled environment?

In a controlled environment, entanglement can last for a longer period of time compared to a non-controlled environment. However, the exact duration of entanglement can vary depending on the specific conditions of the experiment and the type of particles being entangled.

4. Is there a limit to how long entanglement can last?

There is currently no known limit to how long entanglement can last. However, as mentioned before, entanglement can be affected by external factors which can cause it to decay over time. Additionally, the further apart the entangled particles are, the more likely it is that the entanglement will be disrupted.

5. Can entanglement be re-established after it has ended?

It is possible to re-establish entanglement between particles that have previously been entangled, but it is not a guaranteed process. The success of re-establishing entanglement depends on various factors, such as the state of the particles and the amount of time that has passed since the initial entanglement ended.

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