# Generation of bright two-color continuous variable entanglement.

@article{Villar2005GenerationOB, title={Generation of bright two-color continuous variable entanglement.}, author={Alessandro S. Villar and Luciano S. Cruz and Katiuscia Nadyne Cassemiro and Marcelo Martinelli and Paulo A. Nussenzveig}, journal={Physical review letters}, year={2005}, volume={95 24}, pages={ 243603 } }

We present the first measurement of squeezed-state entanglement between the twin beams produced in an optical parametric oscillator operating above threshold. In addition to the usual squeezing in the intensity difference between the twin beams, we have measured squeezing in the sum of phase quadratures. Our scheme enables us to measure such phase anticorrelations between fields of different frequencies. In the present measurements, wavelengths differ by approximately 1 nm. Entanglement is…

## 171 Citations

### Experimental demonstration of quantum entanglement between frequency-nondegenerate optical twin beams.

- PhysicsOptics letters
- 2006

The quantum entanglement of amplitude and phase quadratures between two intense optical beams with a total intensity of 22 mW and a frequency difference of 1 nm, which are produced from an optical…

### Two-color continuous-variable entanglement generated in nondegenerate optical parametric oscillator

- Physics
- 2012

### Observation of entanglement between two light beams spanning an octave in optical frequency.

- PhysicsPhysical review letters
- 2008

It is experimentally demonstrated how two beams of light separated by an octave in frequency can become entangled after their interaction in a chi;(2)} nonlinear medium, thereby satisfying the criterion of entanglement.

### Continuous Variable Entanglement Distribution for Long-Distance Quantum Communication

- Physics
- 2013

We develop a frequency-tunable two-color continuous variable entangled state and demonstrate the entanglement distribution over a telecom single mode fiber. One beam of the entangled state (795 nm)…

### Large-scale multipartite entanglement in the quantum optical frequency comb of a depleted-pump optical parametric oscillator

- PhysicsQuantum Inf. Comput.
- 2012

We show theoretically that multipartite entanglement is generated on a massive scale in the spectrum, or optical frequency comb, of a single optical parametric oscillator (OPO) emitting well above…

### Entangled Images from Four-Wave Mixing

- PhysicsScience
- 2008

A spatially multimode amplifier based on four-wave mixing in a hot vapor is used to produce twin images that exhibit localized entanglement, demonstrating that the system is an ideal source for parallel continuous-variable quantum information protocols.

### The quest for three-color entanglement: experimental investigation of new multipartite quantum correlations.

- PhysicsOptics express
- 2007

Results approach the limit required to demonstrate three-color entanglement in an above-threshold optical parametric oscillator, and new quantum correlations are observed among the pump and signal or idler beams, as well as among a combined quadrature of signal and idler fields.

### Generation of Enhanced Three-Mode Continuously Variable Entanglement

- Physics
- 2011

The generation of enhanced three-mode continuously variable (CV) entanglement via difference-frequency amplification in an optical cavity above the threshold is investigated. The quantum entanglement…

### Entanglement in the above-threshold optical parametric oscillator

- Physics
- 2007

We investigate entanglement in the above-threshold optical parametric oscillator, both theoretically and experimentally, and discuss its potential applications to quantum information. The…

### Robust generation of bright two-color entangled optical beams from a phase-insensitive optical parametric amplifier

- Physics
- 2012

Bright two-color continuous variable (CV) entangled optical beams at 0.8 and 1.5 μm are generated by utilizing a phase-insensitive optical parametric amplifier with only 1.5 μm signal field injected.…

## References

SHOWING 1-10 OF 37 REFERENCES

### Quantum computation and quantum information

- PhysicsMathematical Structures in Computer Science
- 2007

This special issue of Mathematical Structures in Computer Science contains several contributions related to the modern field of Quantum Information and Quantum Computing. The first two papers deal…

### Phys

- Rev. Lett. 60, 2731
- 1988

### Phys. Rev. Lett

- Phys. Rev. Lett
- 1987

### Phys. Rev. A

- Phys. Rev. A
- 2000

### PRL 95

- PRL 95
- 2005

### Opt. Commun

- Opt. Commun
- 2004

### Phys. Rev. Lett

- Phys. Rev. Lett
- 1998

### Electronic address: nussen@if.usp

- Electronic address: nussen@if.usp

### Opt. Lett

- Opt. Lett
- 2005

### Phys

- Rev. Lett. 92, 203601
- 2004