Demonstration of nanophotonic NOT gate using near-field optically coupled quantum dots

潔 小林, Kiyoshi Kobayashi

K. Nishibayashi, Takumi Yamamoto, Tadashi Kawazoe +3 more

We demonstrated nanophotonic gate operation of coupled InAs quantum dots using the pump-and-probe micro-photoluminescence measurement. The result indicates that we can select either AND- or NOT-gate operation by controlling the pulse intensity.

Jeremy L. O’Brien, Geoff J. Pryde, Andrew G. White +2 more

Mathias Staunstrup, Alexey Tiranov, Ying Wang +7 more

Realizing a sensitive photon-number-dependent phase shift on a light beam is required both in classical and quantum photonics. It may lead to new applications for classical and quantum photonics machine learning or pave the way for realizing photon-photon gate operations. Non-linear phase-shifts require efficient light-matter interaction, and recently quantum dots coupled to nanophotonic devices have enabled near-deterministic single-photon coupling. We experimentally realize an optical phase shift of $0.19 π\pm 0.03$ radians ($\approx 34$ degrees) using a weak coherent state interacting with a single quantum dot in a planar nanophotonic waveguide. The phase shift is probed by interferometric measurements of the light scattered from the quantum dot in the waveguide. The nonlinear process is sensitive at the single-photon level and can be made compatible with scalable photonic integrated circuitry. The work may open new prospects for realizing high-efficiency optical switching or be applied for proof-of-concept quantum machine learning or quantum simulation demonstrations.

Alejandro González-Tudela, Andreas Reiserer, Juan José García‐Ripoll +1 more

Mathias Staunstrup, Alexey Tiranov, Ying Wang +7 more

Realizing a sensitive photon-number-dependent phase shift on a light beam is required both in classical and quantum photonics. It may lead to new applications for classical and quantum photonics machine learning or pave the way for realizing photon-photon gate operations. Nonlinear phase-shifts require efficient light-matter interaction, and recently quantum dots coupled to nanophotonic devices have enabled near-deterministic single-photon coupling. We experimentally realize an optical phase shift of 0.19π ± 0.03 radians ( ≈ 34 degrees) using a weak coherent state interacting with a single quantum dot in a planar nanophotonic waveguide. The phase shift is probed by interferometric measurements of the light scattered from the quantum dot in the waveguide. The process is nonlinear in power, the saturation at the single-photon level and compatible with scalable photonic integrated circuitry. The work may open new prospects for realizing high-efficiency optical switching or be applied for proof-of-concept quantum machine learning or quantum simulation demonstrations.