Emission and coherent control of Levitons in graphene

• 成果类型: Article
• 署名作者: Assouline, A.; Pugliese, L.; Chakraborti, H.; Lee, Seunghun; Bernabeu, L.; Jo, M.; Watanabe, K.; Taniguchi, T.; Glattli, D. C.; Kumada, N.; Sim, H. -S; Parmentier, F. D.; Roulleau, P.
• 署名单位: Universite Paris Saclay; CEA; Centre National de la Recherche Scientifique (CNRS); Centre National de la Recherche Scientifique (CNRS); Universite Paris Saclay; Korea Advanced Institute of Science & Technology (KAIST); NTT, Inc
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-13484
• DOI: 10.1126/science.adf9887
• 发表日期: 2023-12-15
• 页码: 1260-1264
• 关键词: valley; electrons; STATES

摘要

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.