Entangled photons on demand

Matthew Chalmers

Anonymous

Katharina D. Zeuner, Klaus D. Jöns, Lucas Schweickert +9 more

On-demand sources of entangled photons for the transmission of quantum information in the telecom C-band are required to realize fiber-based quantum networks. So far, non-deterministic sources of quantum states of light were used for long distance entanglement distribution in this lowest loss wavelength range. However, they are fundamentally limited in either efficiency or security due to their Poissonian emission statistics. Here, we show on-demand generation of entangled photon pairs in the telecom C-band by an InAs/GaAs semiconductor quantum dot. Using a robust phonon-assisted excitation scheme we measure a concurrence of $91.4\,\%$ and a fidelity of $95.2\,\%$ to $Φ^+$. On-demand generation of polarization entangled photons will enable secure quantum communication in fiber-based networks. Furthermore, applying this excitation scheme to several remote quantum dots tuned into resonance will enable first on-demand entanglement distribution over large distances for scalable real-life quantum applications.

Kan Takase, Shuntaro Takeda, Akira Furusawa

We demonstrate on-demand generation of photonic entanglement by dynamically controlling a loop-based circuit at nanosecond timescale. We generate 6 types of entangled states including 1000-mode 1D-cluster states without changing the circuit architecture.

Climério Paulo da Silva Neto

Kan Takase, Shuntaro Takeda, Akira Furusawa

We demonstrate on-demand generation of photonic entanglement by dynamically controlling a loop-based circuit at nanosecond timescale. We generate 6 types of entangled states including 1000-mode lD-clustcr states without changing the circuit architecture. © 2019 The Author(s)