Wednesday, August 8th 11:-12:00 Haus Room
Title: Toward quantum computational and sensing supremacy based on
multiphoton interference
speaker: Vincenzo Tamma (U Portsmouth)
Abstract
Multiphoton quantum interference underpins fundamental tests of quantum
mechanics and quantum technologies, including applications in quantum
computing, quantum sensing and quantum communication. However, standard
quantum information processing schemes rely on the generation of a large
number of identical photons.
In particular, scattershot boson sampling experimental demonstrations of
quantum computational supremacy are challenged by the need to generate the
same temporal and frequency spectra for a large number N of single photons,
leading to a probability of success which scales down as the root of N and
only if N^2 sources are used. Here, we employ sampling in the photonic
input occupation numbers when N or more input channels are occupied to
achieve for the first time a probability of success arbitrary close to one
with only a linear number N of sources.
We also show how the difference in the photonic spectral properties,
instead of being a drawback to overcome in experimental realisations, can
be exploited as a remarkable quantum resource. Interestingly, we
demonstrate how harnessing the full multiphoton quantum information stored
in the photonic spectra by frequency and time resolved correlation
measurements in linear interferometers enables the characterization of
multiphoton networks and states, produces a wide variety of multipartite
entanglement, and further scale-up experimental demonstrations of quantum
computational supremacy.
References
[1] S. Laibacher and V. Tamma arXiv:1801.03832 (2018), arXiv:1706.05578
(2017)
[2] V. Tamma and S. Laibacher, Phys. Rev. Lett. 114, 243601 (2015)
[3] S. Laibacher and V. Tamma, Phys. Rev. Lett. 115, 243605 (2015)
[4] V. Tamma and S. Laibacher, Quantum Inf. Process. 15(3), 1241-1262
(2015)
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