Universal quantum control of an atomic spin qubit on a surface

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 e...

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Bibliographic Details
Published in:npj quantum information 2023-05, Vol.9 (1), p.48-6, Article 48
Main Authors: Wang, Yu, Haze, Masahiro, Bui, Hong T., Soe, We-hyo, Aubin, Herve, Ardavan, Arzhang, Heinrich, Andreas J., Phark, Soo-hyon
Format: Article
Language:English
Subjects:
639/766/483/2802
639/766/483/481
Classical and Quantum Gravitation
Electron spin resonance
Electrons
Magnetic fields
Microscopy
Physics
Physics and Astronomy
Quantum Computing
Quantum Field Theories
Quantum Information Technology
Quantum Physics
Relativity Theory
Scanning tunneling microscopy
Spintronics
String Theory
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Summary: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.
ISSN:2056-6387
2056-6387
DOI:10.1038/s41534-023-00716-6