ABSTRACT
Quantum networking plays an incredibly important role in quantum technology, e.g., global quantum network requires quantum communication over long distance; distributed quantum computing requires every node sharing information to realize large-scale computing task; quantum sensing or clocks could take advantages in sharing the quantum resources in the network to enhance measurement accuracy. Therefore, harnessing the flying qubits, i.e., photons, and further manipulating the interface between photons and atom-like platform are the key problems. Cold atomic ensemble is one of the potential atom-photon interfaces equipped with long-lived quantum memory and efficient schemes for being the quantum emitter.
For long-distance fiber-free communication, propagation-variant wave packets, e.g., Airy packet, are generated by simultaneously manipulating their spatial and temporal degrees of freedom. But the Airy-shaped packet has only been achieved in the classical regime and has never been realized in the single-photon quantum realm. Here, we demonstrate for the first time a spatiotemporal photon bullet in the quantum realm by exploiting the slow light effect of cold atomic gases.
Open system is another interesting topic in atom-photon interface when loss is brought into the system, and we show how Hermiticity makes bosons behave like fermions. This is a versatile platform to verify that non-Hermitian physics actually can cause observable effects in the quantum regime.
Decoherence of the interface is manipulated and optimized in our demonstration. A fictitious magnetic field created by a far-detuned AC-Stark beam applying on the ensemble can compensate the environmental temporal fluctuations and spatial inhomogeneities of the residue magnetic field. The advantage of the usage of AC-Stark induced fictitious magnetic fields for manipulating the decoherence is the engineering speed and precision.
BIOGRAPHY
Jiefei Chen has gained her Ph.D degree in Hong Kong Univeristy of Science and Technology in 2012, and join East China Normal University in 2012 as a researcher. In 2019, Dr. Chen joined SUSTech as a joint Associate Professor of SIQSE and Physics Department of Southern University of Science and Technology. Winner of 2011 Young Scientist Award in Physical/Mathematical Science, awarded by Hong Kong Institution of Science; 2016 Critical Progress of Optics in China: Temporal Purity and Quantum Interference of Single Photons from Two independent Cold Atomic Ensembles. Her resesarch area include quantum optics and atomic, molecular and optical physics. Research projects include national science foundation in precision measurement, quantum control etc.
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