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Emission and coherent control of Levitons in graphene
Ist Teil von
Science (American Association for the Advancement of Science), 2023-12, Vol.382 (6676), p.1260-1264
Ort / Verlag
United States: The American Association for the Advancement of Science
Erscheinungsjahr
2023
Quelle
Science Online科学在线
Beschreibungen/Notizen
Flying qubits encode quantum information in propagating modes instead of stationary discrete states. Although photonic flying qubits are available, the weak interaction between photons limits the efficiency of conditional quantum gates. Conversely, electronic flying qubits can use Coulomb interactions, but the weaker quantum coherence in conventional semiconductors has hindered their realization. In this work, we engineered on-demand injection of a single electronic flying qubit state and its manipulation over the Bloch sphere. The flying qubit is a Leviton propagating in quantum Hall edge channels of a high-mobility graphene monolayer. Although single-shot qubit readout and two-qubit operations are still needed for a viable manipulation of flying qubits, the coherent manipulation of an itinerant electronic state at the single-electron level presents a highly promising alternative to conventional qubits.