21 February 2013 Efficient single-photon frequency conversion using a Sagnac interferometer
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We present a quantum nanophotonic scheme to achieve efficient single-photon frequency conversion. This mechanism is essential for integrated nanophotonics, as it can provide access to frequency regimes in which no single-photon sources are currently available. Moreover, such a device could be used as the basis of a photonic frequency-shift-keyed quantum information scheme. The proposed scheme uses a Sagnac interferometer to exploit quantum interference between two transition pathways in a three-level quantum dot. In the proposed scheme, an input photon induces a complete population state transfer on the Lambda-type quantum dot, causing a frequency shift in the outgoing photon. The Sagnac interferometer is used to put the input photon into a superposition of counterpropagating states which interfere at the quantum dot, providing the necessary quantum interference to make the process efficient. We have developed a real-space theoretical approach and a computationally efficient pseudospectral numerical method to invegtigate the full spatiotemporal dynamics of the scattering process. It is shown that the efficiency of the frequency-conversion process approaches unity in the ideal case, and is greater than 80% even in the presence of realistic dissipation.
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Matthew Bradford, Matthew Bradford, Jung-Tsung Shen, Jung-Tsung Shen, } "Efficient single-photon frequency conversion using a Sagnac interferometer", Proc. SPIE 8632, Photonic and Phononic Properties of Engineered Nanostructures III, 863204 (21 February 2013); doi: 10.1117/12.2004805; https://doi.org/10.1117/12.2004805

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