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Old Sep 12th 2019, 01:26 PM   #11
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Old Sep 13th 2019, 06:39 AM   #12
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Lasers cooling is getting close to zero kelvin. Superfluids, Bose Einstein condensates have some weird properties What Does Absolute Zero Mean? | DiscoverMagazine.com

A BEC consisting of multiple particles is considered to behave as one particle. Am I correct in assuming there is only one field in a condensate not multiple interacting fields?

In QFT all things are Fields.
Once the condensate is heated it breaks up into its separate disconnected fields. BUT During the period the condensate exists, are the individual particles in the condensate considered entangled or not.
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Old Sep 13th 2019, 07:52 AM   #13
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Originally Posted by interested View Post
Lasers cooling is getting close to zero kelvin. Superfluids, Bose Einstein condensates have some weird properties What Does Absolute Zero Mean? | DiscoverMagazine.com
Yep. You basically use a laser to pop off the particles that have the highest energy in the distribution, leaving behind only those particles with the lowest energy and cooling the system overall.

A BEC consisting of multiple particles is considered to behave as one particle. Am I correct in assuming there is only one field in a condensate not multiple interacting fields?
A Bose-Einstein Condensate is just best described by considering the whole thing as a single quantum system using a Bose-Einstein distribution. Wave functions and probability density functions (PDFs) that describe quantum systems are not fields, at least in the way we normally describe things as fields...

In QFT all things are Fields.
Once the condensate is heated it breaks up into its separate disconnected fields. BUT During the period the condensate exists, are the individual particles in the condensate considered entangled or not.
I don't know anything about QFT (I bought a textbook on it recently and I still need to work through it!), but in general the physics of a BEC requires the modeller to consider it as a single quantum system to get the best results.

Entanglement is a specific phenomenon involving two photons where they are considered to belong to the same quantum system, so it's loosely related, I guess... but I wouldn't call atoms in a BEC entangled just because they can also be described using a single quantum system.

A car can be described as a vehicle and so can a boat, but that doesn't necessarily mean that the way a car can be described can also be applied to a boat.
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Old Sep 15th 2019, 09:40 AM   #14
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Originally Posted by benit13 View Post
(I bought a textbook on it recently and I still need to work through it!), but in general the physics of a BEC requires the modeller to consider it as a single quantum system to get the best results.

Entanglement is a specific phenomenon involving two photons where they are considered to belong to the same quantum system, so it's loosely related, I guess... but I wouldn't call atoms in a BEC entangled just because they can also be described using a single quantum system.
I bought quantum field theory for the gifted amateur some time ago, by Lancaster and Blundell, It is heavy going, and Ive decided I aint gifted. But I am getting there slowly.

The similarities between a BEC and entanglement have caused me to do a bit of a trawl of the internet.

Some researchers claim a BEC is a form of entanglement. Others state some of the particles are entangled in the condensate, I am not convinced either way. Here is one link https://www.iqoqi-vienna.at/news-eve...se-einstein-c/

The researchers have taken a BEC separated it into the two clouds, and found the two clouds still remain entangled.

Spooky, the quantum fields must be as one on the spooky plane
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