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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
Published on: May 30, 2014
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Distillation of the two-mode squeezed state.
Yury Kurochkin1, Adarsh S Prasad2, A I Lvovsky3
1Russian Quantum Centre, 100 Novaya Street, Skolkovo, Moscow 143025, Russia.
Physical Review Letters
|March 4, 2014
Summary
We enhanced quantum entanglement and squeezing in a two-mode squeezed state using a photon annihilation operator. This method boosts the photon-pair component, improving entanglement and squeezing by 50% without losing the Gaussian character.
Area of Science:
- Quantum optics
- Quantum information science
Background:
- Two-mode squeezed states are crucial for quantum information processing.
- Parametric down-conversion is a common source for generating these states.
- Entanglement and squeezing are key quantum properties that can be degraded.
Purpose of the Study:
- To experimentally demonstrate entanglement distillation.
- To improve the quality of two-mode squeezed states.
- To investigate the effect of photon annihilation on quantum correlations.
Main Methods:
- Generating two-mode squeezed states via spontaneous parametric down-conversion.
- Applying the photon annihilation operator to both modes of the squeezed state.
- Measuring the degree of squeezing and entanglement before and after the operation.
Main Results:
- Successfully distilled the two-mode squeezed state.
- Increased both squeezing and entanglement by approximately 50%.
- Preserved the Gaussian character of the distilled state due to low initial squeezing.
Conclusions:
- Entanglement distillation is feasible for two-mode squeezed states from parametric down-conversion.
- Photon annihilation offers a viable method to enhance quantum correlations.
- The technique is robust, maintaining the state's essential Gaussian properties.
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