7 research outputs found
Two-Color Bright Squeezed Vacuum
In a strongly pumped non-degenerate traveling-wave OPA, we produce two-color
squeezed vacuum with up to millions of photons per pulse. Our approach to
registering this macroscopic quantum state is direct detection of a large
number of transverse and longitudinal modes, which is achieved by making the
detection time and area much larger than the coherence time and area,
respectively. Using this approach, we obtain a record value of twin-beam
squeezing for direct detection of bright squeezed vacuum. This makes direct
detection of macroscopic squeezed vacuum a practical tool for quantum
information applications.Comment: 4 pages, 4 figure
Polarization-Entangled Light Pulses of 10^5 Photons
We experimentally demonstrate polarization entanglement for squeezed vacuum
pulses containing more than 10^5 photons. We also study photon-number
entanglement by calculating the Schmidt number and measuring its operational
counterpart. Theoretically, our pulses are the more entangled the brighter they
are. This promises important applications in quantum technologies, especially
photonic quantum gates and quantum memories.Comment: 8 pages, 6 figure
Arbitrary-order lensless ghost imaging with thermal light
Arbitrary Nth-order () lensless ghost imaging with thermal light has
been performed for the first time by only recording the intensities in two
optical paths. It is shown that the image visibility can be dramatically
enhanced as the order N increases. It is also found that longer integration
times are required for higher-order correlation measurements as N increases,
due to the increased fluctuations of higher-order intensity correlation
functions.Comment: Updated version; some more detailed explanations provide