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Directional Control of Single-Photon Routing in Asymmetric Quantum Beam Splitter Based on the Additional Quantum Dot

Jong-Ju Ri, Myong-Chol Ko, Su-Ryon Ri +4 more

Journal of Low Temperature PhysicsNov 18, 20243 citations

Interfacing single photons from a quantum dot embedded in a semiconductor nanowire with a laser-cooled atomic ensemble confined to a hollow-core fiber

Paul Anderson, Mohd Zeeshan, Sheng-Xiang Lin +7 more

Bulletin of the American Physical SocietyMay 28, 20190 citations

Single photon routing based on the selective coupling of the side-branch in the Plasmonic hybrid nanosystem with dipole–dipole interaction

Su-Ryon Ri, Myong-Chol Ko, Nam-Chol Kim +3 more

We propose a theoretical model for the single photon quantum router that consists of two plasmonic waveguides, one of which is infinite and the other is semi-infinite, coupled to two two-level quantum dots (QDs) with dipole–dipole interaction (DDI). The infinite waveguide, the main branch, couples with both QDs, and the semi-infinite, the side branch, couples with the main branch at the position of one of the QDs. In such a system the incident single photon can also be transferred to the side branch, not only be transmitted or reflected. The results show that the transfer rate mainly depends on the coupling strength between the QDs and the two waveguides, but there exists a certain limit in the increase of the transfer rate. The DDI between the QDs gives a remarkable change to the routing spectra and the routing properties are different according to the position of the side branch. The proposed system is indeed multi-channel single photon quantum router, which has more practical significance than the one-dimensional router and can be employed in multi-user quantum networking.We propose a theoretical model for the single photon quantum router that consists of two plasmonic waveguides, one of which is infinite and the other is semi-infinite, coupled to two two-level quantum dots (QDs) with dipole–dipole interaction (DDI). The infinite waveguide, the main branch, couples with both QDs, and the semi-infinite, the side branch, couples with the main branch at the position of one of the QDs. In such a system the incident single photon can also be transferred to the side branch, not only be transmitted or reflected. The results show that the transfer rate mainly depends on the coupling strength between the QDs and the two waveguides, but there exists a certain limit in the increase of the transfer rate. The DDI between the QDs gives a remarkable change to the routing spectra and the routing properties are different according to the position of the side branch. The proposed system is indeed multi-channel single photon quantum router, which has more practical significance than the one-dimensional router and can be employed in multi-user quantum networking.

International Journal of Modern Physics BSep 7, 20232 citations

Bidirectional single photon interference based on a semiconductor quantum dot sandwitched by single mode optical fibers

Takayuki Ishida

The Japan Society of Applied PhysicsFeb 6, 20140 citations

Observation of strongly entangled photon pairs from a nanowire quantum dot

Marijn A. M. Versteegh, Michael E. Reimer, Klaus D. Jöns +5 more

A bright photon source that combines high-fidelity entanglement, on-demand generation, high extraction efficiency, directional and coherent emission, as well as position control at the nanoscale is required for implementing ambitious schemes in quantum information processing, such as that of a quantum repeater. Still, all of these properties have not yet been achieved in a single device. Semiconductor quantum dots embedded in nanowire waveguides potentially satisfy all of these requirements; however, although theoretically predicted, entanglement has not yet been demonstrated for a nanowire quantum dot. Here, we demonstrate a bright and coherent source of strongly entangled photon pairs from a position-controlled nanowire quantum dot with a fidelity as high as 0.859±0.006 and concurrence of 0.80±0.02. The two-photon quantum state is modified via the nanowire shape. Our new nanoscale entangled photon source can be integrated at desired positions in a quantum photonic circuit, single-electron devices and light-emitting diodes.A bright photon source that combines high-fidelity entanglement, on-demand generation, high extraction efficiency, directional and coherent emission, as well as position control at the nanoscale is required for implementing ambitious schemes in quantum information processing, such as that of a quantum repeater. Still, all of these properties have not yet been achieved in a single device. Semiconductor quantum dots embedded in nanowire waveguides potentially satisfy all of these requirements; however, although theoretically predicted, entanglement has not yet been demonstrated for a nanowire quantum dot. Here, we demonstrate a bright and coherent source of strongly entangled photon pairs from a position-controlled nanowire quantum dot with a fidelity as high as 0.859±0.006 and concurrence of 0.80±0.02. The two-photon quantum state is modified via the nanowire shape. Our new nanoscale entangled photon source can be integrated at desired positions in a quantum photonic circuit, single-electron devices and light-emitting diodes.

arXiv:1405.4278Nature CommunicationsOct 31, 2014234 citations

Quantum and nonlinear optics at the single photon level with quantum dots in optical nanocavities

Jelena Vuckovic A

Bulletin of the American Physical SocietyMar 4, 20140 citations

Control of directional routing properties of single photons using a two-level CdS quantum dot embedded in the cross-point of silver nanowire with a side branch

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Control of directional routing properties of single photons using a two-level CdS quantum dot embedded in the cross-point of silver nanowire with a side branch

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