Quantum Communications with Alice in orbit

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• Paolo Villoresi (University of Padua)
• Friday 13 November 2015, 14:00-15:00
• Physics East 217.

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Quantum Communications on planetary scale envisage applications of global cryptographic key distribution as well as of fundamental tests in Quantum Mechanics. The exchange of a generic qubits indeed opens to the paradigms of Quantum Information the very large scale offered by the space missions.

The realization of space Quantum Communications requires the realization of a measure of a quantum state using a telescope—Bob—that is receiving along a channel with a transmitter—Alice—in orbit. The most intuitive approach for coding the qubits is the polarization of single photons or of coherent states with Poisson parameter of the order of one. The effective measurement is possible only after the implementation of three different class of selection in the detection process: spectral, temporal and on the spatial modes.

We will address the experimental studies on the faithful transmission of qubits from Space to ground and demonstrates the means for realizing Quantum Communications on these channels from LEO and MEO as well using different degrees of freedom of the photons.

References

1. P. Villoresi et al., Experimental verification of the feasibility of a quantum channel between space and Earth, New J. Phys. 10, 033038 (2008).

2. D. Bacco et al., Nature Commun. 4, 2363 (2013) .

3. G. Vallone et al, Experimental Satellite Quantum Communications, Phys. Rev. Lett. 115, 040502 (2015).

4. D. Dequal et al. Experimental single photon exchange along a space link of 7000 km, arXiv:1509.05692 (2015).

5. G. Vallone et al. Quantum interference along satellite-­‐ground channels, arXiv:1509.07855 (2015).

This talk is part of the Cold Atoms series.

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