2010 NSF IGERT Annual Meeting


The IGERT annual meeting occurred in Washington, DC from May 23-25th. Veronika Stelmakh attended the meeting and presenting a poster at the meeting.


High-flux source of fiber-coupled narrowband polarization entangled photons using a cavity-enhanced Sagnac interferometer
Veronika Stelmakh, Valentina Schettini, Franco Wong, Massachusetts Institute of Technology.

The goal of our research is to develop a narrowband source of polarization entangled photons for the emerging field of photonic quantum information processing such as quantum communications and quantum computing. One of the standard methods for generating entangled photons is by the phenomenon of spontaneous parametric down conversion (SPDC), where a pump photon passing through a nonlinear crystal is split into two photons of lower frequencies called signal and idler. In our experiment this crystal is placed inside a Sagnac interferometer and bi-directionally pumped to yield a high-flux source of high-quality polarization entangled photons. To efficiently interface the produced photons with atoms in a quantum network, their frequency bandwidth must match that of the atom. Our solution is to place the Sagnac source inside an optical cavity, so that it imposes resonance boundary conditions on the SPDC emission such that it generates a comb of narrowband down-conversion outputs that are equally spaced in the frequency domain. If we succeed, this would provide researchers in the field of entanglement sources a compact procedure for generating narrowband entangled photons.

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