Related papers: Robust entangled photon generation by Floquet-engineered two-colour pulses

Robust entangled photon generation by Floquet-engineered two-colour pulses

URL: http://arxiv.org/abs/2504.02753v2
Date: Sat, 05 Apr 2025 05:53:39 GMT
Title: Robust entangled photon generation by Floquet-engineered two-colour pulses
Authors: Jun-Yong Yan, Paul C. A. Hagen, Hans-Georg Babin, Andreas D. Wieck, Arne Ludwig, Chao-Yuan Jin, Vollrath M. Axt, Da-Wei Wang, Moritz Cygorek, Feng Liu,
Abstract summary: Quantum emitters driven by resonant two-photon excitation are a leading source for deterministically generated entangled photon pairs.<n>Here, we demonstrate how biexciton preparation schemes with significantly improved robustness and reduced laser filtering requirements can be identified.<n>We achieve a biexciton occupation exceeding 96% and preserve photon-pair entanglement with a fidelity of 93.4%.
Score: 9.495960854907576
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: Quantum emitters driven by resonant two-photon excitation are a leading source for deterministically generated entangled photon pairs, essential for scalable photonic quantum technologies. However, conventional resonant schemes are highly sensitive to laser power fluctuations and pose additional experimental challenges for emitters with small biexciton binding energies. Here, we demonstrate how biexciton preparation schemes with significantly improved robustness and reduced laser filtering requirements can be identified using a novel design principle beyond resonant and adiabatic driving: ultrafast all-optical Floquet engineering. This is achieved by employing two strongly and symmetrically detuned dichromatic pulses, whose superposition generates a stroboscopic Hamiltonian that enables direct coupling between ground and biexciton states. Moreover, a pulse delay serves as a tuning knob, introducing an effective magnetic field that concentrates the Bloch sphere trajectory at the biexciton state for a wide range of parameters, making biexciton preparation particularly robust. Experimentally, we achieve a biexciton occupation exceeding 96% and preserve photon-pair entanglement with a fidelity of 93.4%. Our scheme highlights the great impact of Floquet-engineered multicolour excitation protocols for on-demand quantum light sources.

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