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Interference at the Single Photon Level Along Satellite-Ground Channels.
Giuseppe Vallone1, Daniele Dequal1, Marco Tomasin1
1Dipartimento di Ingegneria dell'Informazione, Università degli Studi di Padova, Padova 35131, Italy.
Physical Review Letters
|July 9, 2016
Summary
This study demonstrates quantum interference using single photons from a moving satellite, extending quantum mechanics tests to space. The experiment achieved high visibility, proving photon temporal modes are viable for space-based quantum communication and physics experiments.
Area of Science:
- Quantum physics
- Quantum optics
- Satellite technology
Background:
- Quantum interference confirms quantum mechanics but requires testing in new conditions.
- Exploring quantum phenomena with moving, distant objects is crucial for extending experimental limits.
Purpose of the Study:
- To experimentally demonstrate single-photon interference using temporal modes from a rapidly moving satellite.
- To investigate the feasibility of quantum communication and fundamental physics tests in space.
Main Methods:
- Utilizing coherent superposition of two temporal modes of single photons reflected by a satellite.
- Employing real-time laser ranging to measure satellite distance and predict interference phase.
- Observing interference patterns with varying modulations due to satellite speed.
Main Results:
- Achieved single-photon interference at a ground station from a satellite over 1000 km away.
- Observed interference pattern visibility up to 67% with three different satellites.
- Demonstrated interference over path lengths up to 5000 km, confirming the effect of satellite motion on the interference pattern.
Conclusions:
- Photon temporal modes are viable for fundamental tests of quantum mechanics in space.
- The results support the potential of using quantum phenomena for secure space-based quantum communication.
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