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Electron quantum optics is a relatively new field of mesoscopic quantum physics that relies on
the ballistic nature of electron transport in quantum conductors to develop experiments inspired
by quantum optics. In this work[1], on-demand injection of a single electronic flying qubit state
and its manipulation over the Bloch sphere is demonstrated in graphene for the first time. The
flying qubit is a lone electron above the calm Fermi Sea generated by an engineered voltage pulse
which propagates in quantum Hall edge channels of a high mobility monolayer graphene. A unique
graphene Mach-Zehnder interferometer is used to realize Bloch sphere operations and the final
state is read out statistically by shot noise measurements. This work addresses an important topic
at the nexus of quantum information and quantum transport with a flavour of valleytronics in 2D
material.
[1] A. Assouline*, L. Pugliese*, H. Chakraborti*, S. Lee, L. Bernabeu, M. Jo, K. Watanabe, T. Taniguchi,
D.C. Glattli, N. Kumada, H.-S. Sim, F.D. Parmentier, and P. Roulleau†. Emission and coherent control
of leviton in graphene. Science (In Press) (*equal contribution). |