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Article Dans Une Revue npj Quantum Inf. Année : 2023

Universal quantum control of an atomic spin qubit on a surface

Yu Wang
  • Fonction : Auteur
Masahiro Haze
  • Fonction : Auteur
Hong T Bui
  • Fonction : Auteur
We-Hyo Soe
  • Fonction : Auteur
Arzhang Ardavan
  • Fonction : Auteur
Andreas J Heinrich
  • Fonction : Auteur
Soo-Hyon Phark
  • Fonction : Auteur

Résumé

Scanning tunneling microscopy (STM) enables the bottom-up fabrication of tailored spin systems on a surface that are engineered with atomic precision. When combining STM with electron spin resonance (ESR), these single atomic and molecular spins can be controlled quantum-coherently and utilized as electron-spin qubits. Here we demonstrate universal quantum control of such a spin qubit on a surface by employing coherent control along two distinct directions, achieved with two consecutive radio-frequency (RF) pulses with a well-defined phase difference. We first show transformations of each Cartesian component of a Bloch vector on the quantization axis, followed by ESR-STM detection. Then we demonstrate the ability to generate an arbitrary superposition state of a single spin qubit by using two-axis control schemes, in which experimental data show excellent agreement with simulations. Finally, we present an implementation of two-axis control in dynamical decoupling. Our work extends the scope of STM-based pulsed ESR, highlighting the potential of this technique for quantum gate operations of electron-spin qubits on a surface.
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Dates et versions

hal-04110460 , version 1 (12-11-2023)

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Yu Wang, Masahiro Haze, Hong T Bui, We-Hyo Soe, Herve Aubin, et al.. Universal quantum control of an atomic spin qubit on a surface. npj Quantum Inf., 2023, 9 (1), pp.48. ⟨10.1038/s41534-023-00716-6⟩. ⟨hal-04110460⟩
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