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“From multi-photon entanglement to quantum computational advantage"

Date:

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Time:

Thursday, 28 Jan 2021

Video-Recording for any system with MP4-support

- Video.mp4 (ca.376 Mb)

15:15 – 16:40

16:42 – 16:50

Abstract:

Photons, the fast flying qubits which can be controlled with high precision using

linear optics and have weak interaction with environment, are the natural

candidate for quantum communications. By developing a quantum science satellite

Micius and exploiting the negligible decoherence and photon loss in the out space,

practically secure quantum cryptography, entanglement distribution, and quantum

teleportation have been achieved over thousand kilometer scale, laying the

foundation for future global quantum internet. Surprisingly, despite the extremely

weak optical nonlinearity at single-photon level, an effective interaction between

independent indistinguishable photons can be effectively induced by a multi-photon

interferometry, which allowed the first creation of multi-particle entanglement and

test of Einstein’s local realism in the most extreme way. By developing high-

performance quantum light sources, the multi-photon interference has been scaled

up to implement boson sampling with up to 76 photons out of a 100-mode

interferometer, which yields a Hilbert state space dimension of 1030 and a rate

that is 1014 faster than using the state-of-the-art simulation strategy on

supercomputers. Such a demonstration of quantum computational advantage is a

much-anticipated milestone for quantum computing.

The special-purpose photonic platform will be further used to investigate practical

applications linked to the Gaussian boson sampling, such as graph optimization

and quantum machine learning.

Speaker today: Jian-Wei Pan (University of Science and Technology of China)