How Do You Break Quantum Entanglement Bonds?

[VictorMedvil]

I was doing some research into quantum entanglement but it is never well described how you break the bonds once they are formed does anyone have any expertise in this area on how to break quantum entanglement bonds? The best that I can understand is the bond is broken when interaction with the environment happens, anyone have any idea about this subject?

Paper, link = https://ui.adsabs.harvard.edu/abs/2018JPCM...30s5602B/abstractCan entangled particles become disentangled?

"Decoupling is the tendency for entangled particles to become disentangled due to interaction with their surroundings, while the no cloning theorem states that quantum states cannot be copied. This makes long distance communication difficult, and, to overcome this, researchers have employed quantum repeaters."


Would a EMP(https://en.wikipedia.org/wiki/Electromagnetic_pulse) disrupt electron quantum entanglement bonds?

 

[.Scott]

The first thing that strikes me about your question is the use of the term "bond". Entanglement is a shared state. When I hear the word "bond" used in Physics or Chemistry, it's almost always a force that is binding particles or atoms together.

That said...

When two particles are entangled, it is one of their quantum states that is being shared. If you measure that state in one particle, the entanglement is gone, but the information you collected may give you a clue about what result to expect if a similar measurement is made on its partner.

Information is the key here. If you can manipulate the particle without affecting or measuring the entangled quantum state, you can maintain the entanglement.

In your specific case of an EMP, or any radio pulse, there may be an interaction between an EMP photon and the particle with the entangled property. If that interaction occurs and it specifically affects the quantum state, the entanglement is almost certainly doomed.

The only reason I am hedging with the phrase "almost certainly" is that it is possible to have interactions that avoid immediate measurements.

 

[Heidi]

the "bond" does not disappear when you measure the spin of a Belle pair 0>0> + 1>1>
you get 0>0> or 1>1> (the entanglement entropy is null)
in both cases you can say that you still have a bond but its name is no more entanglement. Look at the definitions

 

[VictorMedvil]

the "bond" does not disappear when you measure the spin of a Belle pair 0>0> + 1>1>
you get 0>0> or 1>1> (the entanglement entropy is null)
in both cases you can say that you still have a bond but its name is no more entanglement. Look at the definitions

How do you break the null state forever?

 

[Heidi]

what does it mean to break a null state?

 

[VictorMedvil]

what does it mean to break a null state?

To make it unentangle permanently.

 

[Nugatory]

To make it unentangle permanently.

Are you familiar with the mathematical treatment of the process by which we start with a particle whose state is a superposition of spin-up and spin-down, pass it through a Stern-Gerlach device, and use decoherence to end up with the state in which the particle has landed in one of two possible locations on a screen behind the device and there is no longer any relevant superposition (an improper mixed state)?

If you are not, you will have to close this gap in your understanding before taking on the more complicated question that you’re asking here. There’s just no way of moving beyond “measurement breaks entanglement” without understanding the math behind decoherence.

If you are, then your answer is that it’s basically the same thing, except starting from a more complex superposition, something like $|ab\rangle+|ba\rangle$ where a measurement of one observable effectively determines the value of the other. This non-factorizable superposition describes an entangled system, and (after waving our hands past a number of foundational questions) the decoherent interaction with the environment leads to the system evolving away from this state to one in which there is no relevant superposition and hence no entanglement.

 

[Demystifier]

Entanglement is very much like engagement between a man and a woman. To break it, you must engage one of them with someone else, which cannot happen without interaction.