Unconditional entanglement interface for quantum networks

Abstract

Entanglement drives nearly all proposed quantum information technologies. By up-converting part of a 1550 nm two-mode squeezed vacuum state to 532 nm, we demonstrate the generation of strong continuous-variable entanglement between widely separated frequencies. Nonclassical correlations were observed in joint quadrature measurements of the 1550 and 532 nm fields, showing a maximum noise suppression 5.5 dB below vacuum. Our versatile technique combines strong nonclassical correlations, large bandwidth, and in principle, the ability to entangle the telecommunication wavelength of 1550 nm with any optical wavelength.

5 pages, 4 figures

References in corpus (9)

• The Quantum Internet
• An Elementary Quantum Network of Single Atoms in Optical Cavities
• Experimental demonstration of quantum memory for light
• Quantum Memories. A Review based on the European Integrated Project "Qubit Applications (QAP)"
• Quantum memory for squeezed light
• Testing spooky action at a distance
• Quantum memory for entangled two-mode squeezed states
• Continuous-Variable Quantum Computing in Optical Time-Frequency Modes using Quantum Memories
• Observation of entanglement between two light beams spanning an octave in optical frequency

Cited by in corpus (9)

• Squeezing at a telecom wavelength, a compact and fully guided-wave approach
• Quantum frequency conversion between infrared and ultraviolet
• Entanglement and asymmetric steering over two octaves of frequency difference with cascaded harmonic generation
• Quantum optical frequency up-conversion for polarisation entangled qubits: towards interconnected quantum information devices
• Quantum correlations across two octaves from combined up and down conversion
• Negative Wigner function at telecommunication wavelength from homodyne detection
• A two-way photonic interface for linking Sr+ transition at 422 nm to the telecommunications C-band
• Resource-efficient frequency conversion for quantum networks via sequential four-wave mixing
• Characterization of non-planar ring oscillators at a wavelength of 1064 nm for high precision metrology