Lectures on Quantum Optics and Quantum Information
Lectures on Quantum Optics and Quantum Information
Lectures on Quantum Optics and Quantum Information
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
Q A<br />
Q<br />
<strong>Quantum</strong> C<strong>on</strong>tinuous-Variables<br />
Quantizati<strong>on</strong> of the electromagnetic field<br />
Modes are quantized harm<strong>on</strong>ic oscillators<br />
2 possible observables for the descripti<strong>on</strong>:<br />
Energy or Electric field<br />
P A<br />
P<br />
Squeezing<br />
One can have :<br />
“Noise<br />
reducti<strong>on</strong>”<br />
or “Squeezing”<br />
Discrete degree of freedom<br />
number of phot<strong>on</strong>s N=a + a<br />
(measured by phot<strong>on</strong> counting)<br />
C<strong>on</strong>tinuous degree of freedom<br />
quadratures P <strong>and</strong> Q<br />
(fluctuati<strong>on</strong>s measured by<br />
homodyning, photodiodes)<br />
Why using them?<br />
- Perfect detectors, high<br />
rates/b<strong>and</strong>width<br />
- Deterministic operati<strong>on</strong>s<br />
- N<strong>on</strong>-gaussian states/cluster<br />
states with many potential<br />
applicati<strong>on</strong>s in Q. computing<br />
<strong>and</strong> communicati<strong>on</strong>
Change language