Register to reply 
Spin 1/2 correlation 
Share this thread: 
#1
Mar1212, 08:06 PM

P: 57

Hello all,
Imagine two spin 1/2 particles that are entangled, going towards two sterngerlach apparatuses, with some relative angle. Now imagine one sterngerlach device measures the spin of one of the particles as up. What is the chance that the other sterngerlach device measures the spin to be down? For 90 degrees it would be 50/50, right? So my guess is [itex]cos^2 ({1 \over 2} \alpha)[/itex]. Is that correct? Thanks in advance 


#2
Mar1312, 01:51 PM

P: 110




#3
Mar1312, 03:14 PM

Sci Advisor
PF Gold
P: 5,441

Yes, that's correct. I may have steered you wrong at an earlier time.



#4
Mar1312, 03:16 PM

P: 57

Spin 1/2 correlation
From what I understand from that source, he takes into account two possibilities for the case [itex]\alpha = 90°[/itex]: a 50% correlation and a 100% correlation. I thought it was 50%, which would I believe indicate that I was right thinking the correlation is [itex]cos^2({1 \over 2} \alpha[/itex]. However, I'm not sure what he meant with the 100% correlation. Thanks 


#5
Mar1312, 03:21 PM

P: 57

But thank you again, for your answer now and for your answer last time. 


#6
Mar1312, 03:30 PM

P: 110

As I understood of the answers to my question, the correct answer to your quastion it is 


#7
Mar1312, 03:32 PM

P: 110




Register to reply 
Related Discussions  
Entangled spin correlation  Quantum Physics  3  
In Electron Spin Resonance, Does Spin Up Have More Energy Than Spin Down?  Quantum Physics  2  
Correlation coefficient of twoparticle halfspin entangled state  Advanced Physics Homework  1  
Correlation functions of spin2 fields  Set Theory, Logic, Probability, Statistics  5  
Spin correlation problem  Introductory Physics Homework  0 