dc.contributor.author | Kuzucu, Oktay Onur | |
dc.date.accessioned | 2008-06-19T14:52:58Z | |
dc.date.available | 2008-06-19T14:52:58Z | |
dc.date.issued | 2008-06-19T14:52:58Z | |
dc.identifier.uri | http://hdl.handle.net/1721.1/41868 | |
dc.description | Thesis Supervisor: Franco N.C. Wong
Title: Senior Research Scientist | en |
dc.description.abstract | Recent advances in quantum information processing (QIP) have enabled practical
applications of quantum mechanics in various fields such as cryptography, computation,
and metrology. Most of these applications use photons as carriers of quantum
information. Therefore, engineering the quantum state of photons is essential for
the realization of novel QIP schemes. A practical and flexible technique to generate
high-purity entangled photon pairs is spontaneous parametric downconversion
(SPDC) which finds its use in many QIP applications such as quantum key distribution
(QKD) and linear optics quantum computation. SPDC is often used with
ultrafast lasers to generate photon pairs with precise timing and engineered spectral
properties. In this thesis, we focused on two photonic QIP applications using ultrafastpumped
SPDC. We first pursued the design and implementation of a pulsed narrowband
polarization-entangled photon pairs at 780nm for free-space entanglement-based
QKD. We built and characterized a compact narrowband ultraviolet pump source
and a polarization-entangled photon source based on SPDC in a polarization Sagnac
interferometer. We then studied the generation of coincident-frequency entangled
photons for Heisenberg-limited quantum metrology. Using extended phase-matching
conditions in a periodically-poled KTP crystal, generation of coincident-frequency
entanglement was verified and frequency indistinguishability was achieved for broadband
signal and idler photons at ∼1.58 μm. We also developed a novel time domain
characterization technique based on time-resolved single-photon upconversion. Using
this technique, we measured the joint temporal density of a two-photon state
for the first time and observed temporal anti-correlation for the coincident-frequency
entangled state as predicted by Fourier duality. This new technique complements existing
frequency domain methods for a more complete characterization of two-photon
states. | en |
dc.description.sponsorship | This work was supported by Advanced Research and Development Activity,
Disruptive Technologies Office and Hewlett-Packard Research Laboratories. | en |
dc.language.iso | en_US | en |
dc.relation.ispartofseries | Technical Report (Massachusetts Institute of Technology, Research Laboratory of Electronics); | en |
dc.relation.ispartofseries | #725 | en |
dc.title | Ultrafast Sources of Entangled Photons for Quantum Information Processing | en |
dc.type | Technical Report | en |