Quantum Entanglement

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Quantum Entanglement Bell's Inequalities

• Dan Linford

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Outline

• Historical Motivation
• Our Setup
• Results
• Questions?

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Motivation Bells Inequality

• EPR Experiment

Quantum Picture
agt
bgt
This is strange.
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Motivation Bells Inequality

• EPR Experiment

With local hidden variables
a
b
a
Not so strange. Can we tell these two pictures
apart?
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Motivation Bells Inequality
Is this consistent with quantum mechanical
predictions?
Answer No, quantum mechanics predicts
different probabilities
Reference Griffiths, David (2005). Introduction
to Quantum Mechanics. Upper Saddle River, NJ
Pearson Prentice Hall.
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Experimental Setup
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Spontaneous Parametric Down-Conversion
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CHSH Bell Inequality
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Cos2 Results
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Bell Inequality Results

• S was found to be 2.64, 2.87, and 0.624
• Measured S value exceeds that for hidden variable
  theories

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Acknowledgments

• Dr. Lukishova
• Prof Howell
• Steve Bloch

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• Questions?