26 August 2009 High-efficiency quantum state engineering
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Efficiently creating optical quantum states, both simple (e.g., pure single-photon states) and complex (e.g., polarization-entangled but spectrally unentangled photon pairs), remains an experimental challenge. We report on a novel method that allows for efficiently preparing certain classes of states: by weakly driving repeated downconversion in a cavity, we can pseudo-deterministically add photons to a state, preparing Fock states of definite photon number. We discuss expected performance and experimental limitations, including the difficulty of creating pure photons at a high rate. Additionally, we report on our progress in engineering high-rate spatio-spectrally unentangled downconversion, a key technology for optical quantum information processing, and propose a novel 4-photon experimental scheme to test the intrinsic indistinguishability of the photons from this source.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Kevin T. McCusker, Kevin T. McCusker, Radhika Rangarajan, Radhika Rangarajan, Paul G. Kwiat, Paul G. Kwiat, } "High-efficiency quantum state engineering", Proc. SPIE 7465, Quantum Communications and Quantum Imaging VII, 74650F (26 August 2009); doi: 10.1117/12.826998; https://doi.org/10.1117/12.826998

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