5 research outputs found
Experimental Study of the Quantum States of Light and Realization of a Quantum Communication Protocol\ud
Get PDFI present how to obtain and characterize quantum states of light potentially useful for quantum communication protocols. The control of the frequency correlations,\ud
and the bandwidth, of single and paired photons is an essential ingredient in specific quantum applications, from quantum imaging to quantum clock synchronization.\ud
I show both theoretical and experimental spectral correlations of pairs of photons generated in non-collinear spontaneous parametric down conversion (SPDC). In the second part of the work, a scheme for quantum key distribution using the two-way LM05 protocol [PRL 94, 140501 (2005)] and its implementation is presented too. A preliminary transmission test is discussed together with\ud
an experimental study for the security of the generated key in presence of noise in the channels. The noise is modulated as to simulate the effect of an eavesdropper.\u
Atom-Resonant Heralded Single Photons by Interaction-Free Measurement
Full text linkWe demonstrate the generation of rubidium-resonant heralded single photons
for quantum memories. Photon pairs are created by cavity-enhanced
down-conversion and narrowed in bandwidth to 7 MHz with a novel atom-based
filter operating by "interaction-free measurement" principles. At least 94% of
the heralded photons are atom-resonant as demonstrated by a direct absorption
measurement with rubidium vapor. A heralded auto-correlation measurement shows
, i.e., suppression of multi-photon contributions
by a factor of 25 relative to a coherent state. The generated heralded photons
can readily be used in quantum memories and quantum networks.Comment: 5 pages, 4 figure
Asymmetric delay attack on an entanglement-based bidirectional clock synchronization protocol
No full text10.1063/1.5121489APPLIED PHYSICS LETTERS1151
