'Genuine Decoherence' and Macroscopic Superposition

  • Thread starter StevieTNZ
  • Start date
1,456
365
By 'Genuine Decoherence' - I mean collapse of the wave function by a theory and its mathematical equations.

If a micro system encounters a macroscopic apparatus - in collapse theories a definite state appears for both the apparatus and system, but after a tiny time since the system entangled with the apparatus.

For genuine decoherence to occur and be predicted in a future theory, does it need to allow macroscopic superpositions (even if they last for a short time)?

Of course we can keep current QM formalism and have hidden variables to remove the measurement problem.
 

Nugatory

Mentor
12,329
4,806
Decoherence says that macroscopic superpositions will very quickly resolve themselves into mixed states - Schrödinger's cat wiil very quickly decohere from a macroscopic superposition of dead and alive to a mixed state in which the cat is either dead or alive as surely as a tossed coin is heads or tails.

Thus decoherence doesn't preclude macroscopic superpositions, it just says they don't last very long. This differs from collapse interpretations in which a macroscopic superposition (Schrödinger's both dead and alive cat, for example) can persist until an observation forces the collapse.
 

Want to reply to this thread?

"'Genuine Decoherence' and Macroscopic Superposition" You must log in or register to reply here.

Related Threads for: 'Genuine Decoherence' and Macroscopic Superposition

Replies
1
Views
610
Replies
2
Views
1K
Replies
1
Views
884
Replies
31
Views
2K
Replies
34
Views
6K
Replies
9
Views
681
  • Posted
Replies
3
Views
960

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving

Hot Threads

Top