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VanDevender, Aaron Pace 2012-11-19T16:52:24Z 2012-11-19T16:52:24Z 10000-01-01 2007 We demonstrate the utility of frequency upconversion in a non-linear crystal for quantum information applications. By combining a bright “escort” beam with a signal photon inside of a periodically poled lithium niobate (PPLN) crystal, we are able to achieve near unit conversion efficiency. We use this conversion process to create high-efficiency infrared single-photon detectors by upconverting infrared photons to visible ones and using efficient silicon avalanche photo diodes to detect the upconverted photon. We have achieved a net system detection efficiency of 56%, far superior to previous methods for infrared photon detection. We also demonstrate the phase coherence of the upconversion process, which enables it to convert photonic qubits from one wavelength to another, potentially allowing quantum networks of disparate operating wavelengths to communicate efficiently. This quantum “transduction” feature is observed by upconverting photons passed between two unbalanced Michelson interferometers that create and measure time-bin qubits, similar to those used in many quantum cryptography systems, and verifying that the phase of the qubits is preserved. The Rabi oscillation-like behavior of upconversion is also demonstrated, allowing for the creation and manipulation of highly non-degenerate frequency qubits. These states may be used in conjunction with other degrees of freedom such as polarization, time-bin, or orbital angular momentum states to enlarge the usable single-photon Hilbert space and create a rich vocabulary for transmission of quantum information. Submitted by Elias Lopez (erlopez2@illinois.edu) on 2012-11-19T16:52:24Z No. of bitstreams: 1 VanDevender_Aaron.pdf: 1418435 bytes, checksum: 5fac7f62cdcbab0337722a3b8a6473b4 (MD5) Made available in DSpace on 2012-11-19T16:52:24Z (GMT). No. of bitstreams: 1 VanDevender_Aaron.pdf: 1418435 bytes, checksum: 5fac7f62cdcbab0337722a3b8a6473b4 (MD5) Previous issue date: 2007 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Elias Lopez (erlopez2@illinois.edu) on 2012-11-19T16:52:24Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:35:27-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis writer has not yet granted open access permission Thesis writer has not yet granted open access permission U of I Only http://hdl.handle.net/2142/35236 en 2007 VanDevender © quantum information rabi oscillation Oscillation polarization escort beam photonic wavelength time-bin orbital angular momentum single-photon photon hilbert space infrared photon ppln phasematching coherence atom simulator polarization switch sagnac switchl mach-zehnder switch- phase modulation Quantum information applications of frequency upconversion Dissertation / Thesis text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.