Researchers have designed a new device that can efficiently create multiple frequency-entangled photons, a feat that cannot be achieved with today's optical devices. The new approach could open a path to more powerful quantum communication and computing technologies.
"Entangling particles efficiently is a critical capability for unlocking the full power of quantum technologies—whether to accelerate computations, surpass fundamental limits in precision measurement, or guarantee unbreakable security using the laws of quantum physics," said Nicolas Fabre from Telecom Paris at the Institut Polytechnique de Paris.
"Photons are ideal because they can travel long distances through optical fibers or free space; however, there hasn't been a way to efficiently generate frequency entanglement between more than two photons."
Frequency entanglement ties photons' colors, or frequencies, together through quantum correlations, adding new spectral degrees of freedom for carrying information.
In the journal Optica Quantum, the researchers report numerical simulation results from their new device, which uses a quantum dot to entangle independent photons' frequencies without needing to filter or select specific photon interactions afterward. The process can be repeated to entangle many photons and is compatible with on-chip photonic platforms, providing a realistic path toward scalable, multi-photon frequency entanglement.
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