Multimode memories in atomic ensembles.
Phys Rev Lett 101:26 (2008) 260502
Abstract:
The ability to store multiple optical modes in a quantum memory allows for increased efficiency of quantum communication and computation. Here we compute the multimode capacity of a variety of quantum memory protocols based on light storage in ensembles of atoms. We find that adding a controlled inhomogeneous broadening improves this capacity significantly.Measuring phonon dephasing with ultrafast pulses using Raman spectral interference
Physical Review B - Condensed Matter and Materials Physics 78:15 (2008)
Abstract:
A technique to measure the decoherence time of optical phonons in a solid is presented. Phonons are excited with a pair of time-delayed 80 fs near infrared pulses via spontaneous transient Raman scattering. The spectral fringe visibility of the resulting Raman pulse pair, as a function of time delay, is used to measure the phonon dephasing time. The method avoids the need to use either narrow band or few femtosecond pulses and is useful for low phonon excitations. The dephasing time of phonons created in bulk diamond is measured to be τ=6.8 ps (Δν=1.56 cm-1). ©2008 The American Physical Society.Experimental quantum detector tomography
Conference on Quantum Electronics and Laser Science (QELS) - Technical Digest Series (2008)
Abstract:
We present the first quantum tomography of a detector, using as examples an avalanche photodiode and a photon-number resolving detector. The resulting POVM set agrees well with one derived from a model of the detector. © 2008 Optical Society of America.Generation of uncorrelated photon-pairs in an optical fiber
Conference on Quantum Electronics and Laser Science (QELS) - Technical Digest Series (2008)