I am working on the generation of squeezed light with a bandwidth of more than 1 GHz.
As a part of quantum information, the quantum key distribution (QKD) is offering a possibility to send a secret key, that cannot be eavesdroped. One way to realize this, is in the use of squeezed states of light. The achieved datarate depends on the strength of the squeezed state as well as on its bandwidth.
The first generation of squeezed states at 1064 nm with more than 1 GHz was a part of my diploma thesis at AEI. Now that the proof of principle experiment is done, further improvements will follow. A useful application in quantum information requires the generation of even stronger squeezed states and a wavelength of 1550 nm. The first point is needed for a sufficient security rate of the quantum key, whereas the wavelength of 1550 nm can be coupled more efficiently into the optical fibres used for modern telecommunication.
The final goal would be the entanglement of two GHz squeezed states and the sending of a QKD through the produced quantum channel.
Max Planck Institute for Gravitational Physics
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