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Manipulating the entanglement of two quantum emitters

  • Institut
  • LP2N
  • Nano-optique et systèmes quantiques

Manipulating the entanglement of two quantum emitters

Entanglement consists in correlating the quantum states of several objects until they reach a collective state where the individual reality of each object fades away. The control and manipulation of entangled quantum states is crucial for the development of quantum technologies. One way to use this property intrinsic to quantum mechanics is to couple quantum light emitters trapped in a transparent solid through their coherent optical dipole-optical dipole interactions. Realizing this technique is in itself a challenge as it requires finding nano-emitters that are both spatially adjacent at the nanoscale and spectrally nearly identical. Another challenge is to manipulate the degree of entanglement of such nano-objects rigidly trapped in their crystalline matrix.

Physicists from the LP2N Nanophotonics group have overcome these two challenges by developing an imaging method operating at cryogenic temperature (2 Kelvin) that allows the localization of pairs of coupled fluorescent molecules within millions of other isolated ones. 

These results are published in the journal Nature Communications, where the authors demonstrate their ability to reach a maximum entanglement regime with the production of states similar to Bell states. There, the subradiant state acquires a long radiative lifetime and becomes a nearly dark state. This capability to entangle or de-entangle electronic states on demand opens the way to the implementation of fast sub-nanosecond scale quantum logic gates on de-localized quantum systems.


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