Lectures on Quantum Optics and Quantum Information
Lectures on Quantum Optics and Quantum Information
Lectures on Quantum Optics and Quantum Information
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Measuring Optical C<strong>on</strong>tinuous-Variables<br />
THE tool : Homodyne detecti<strong>on</strong><br />
<strong>Quantum</strong> state<br />
50/50<br />
Photocurrent<br />
subtracti<strong>on</strong><br />
Local oscillator<br />
Adjustable Phase<br />
• Annihilati<strong>on</strong> operators of the mixed modes:<br />
• After subtracti<strong>on</strong>, the resulting photocurrent operator is:<br />
• Mean Value <strong>and</strong> variance for :<br />
Local oscillator<br />
- Overall Efficiency -<br />
Photodiode efficiency<br />
Interference Visibility V<br />
tot = .V2<br />
(ex: 0.99 x 0.992 =0.97)<br />
For large phot<strong>on</strong> number in lo:
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