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Title: Entangled Photon Pairs: Efficient Generation and Detection, and Bit Commitment
Keywords: Downconversion, High Efficiency, Loophole free Bell test, Transition Edge Sensors TES, Bit commitment, Polarization Entangled Photon Pairs
Issue Date: 30-Jul-2014
Citation: SIDDARTH KODURU JOSHI (2014-07-30). Entangled Photon Pairs: Efficient Generation and Detection, and Bit Commitment. ScholarBank@NUS Repository.
Abstract: This thesis consists of two experiments: an implementation of a quantum bit commitment protocol and the generation and detection of polarization entangled photon pairs with a high heralding efficiency. Quantum bit commitment is a two-party protocol that can be used as a cryptographic primitive for secure identification. We experimentally implemented a protocol for bit commitment by measurements on polarization-entangled photon pairs, thereby demonstrating the feasibility of protocols in the noisy-storage model. We present a highly efficient polarization entangled source of photon pairs obtained from downconversion in a PPKTP crystal. Using Transition Edge Sensors (TES) (detection efficiency > 98&37;) we observe a 75.2&37; pairs to singles ratio of these photon pairs. This efficiency is above the threshold (66.7&37;) for a loophole-free Bell test. In addition to a loophole free bell test our high efficiency would allow us to implement other protocols including device independent fast random number generation and secure quantum communication.
Appears in Collections:Ph.D Theses (Open)

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