Electrical Spin Pumping in Exchange-coupled Molecules
Paul Greule, Wantong Huang, Kwan Ho Au-Yeung, Máté Stark, Johannes Schwenk + 3 more
TLDR
This paper demonstrates remote, all-electrical initialization of electron spins in single molecules using exchange-coupled pairs, crucial for quantum computing.
Key contributions
- Demonstrates remote, all-electrical electron spin initialization in single molecules.
- Utilizes exchange-coupled S=1/2 molecule pairs (Fe-FePc) with ESR-STM.
- Shows angular momentum transfer via exchange interaction between coupled molecules.
- Achieves spin control by tuning current direction/magnitude and exchange coupling strength.
Why it matters
Efficient and remote spin initialization is a critical bottleneck for molecular quantum computing. This all-electrical method offers a general, scalable approach to control qubits, paving the way for practical spin-based quantum architectures.
Original Abstract
Electron spins in single molecules are a promising platform for quantum information processing. However, their practical implementation as qubits requires reliable control at the single-entity level, including an efficient state initialization. Here, we demonstrate the remote, all-electrical initialization of the electron spin in single molecules: Using electron spin resonance scanning tunneling microscopy, we investigate coupled pairs of S=1/2 molecules (Fe-FePc), where one molecule serves as a readout and pumping unit for the neighboring one. We show that the exchange interaction between them enables angular momentum transfer, which allows for the control of the remote spin state via the direction and magnitude of the spin-polarized tunneling current and the exchange coupling strength. These results establish a general, all-electrical approach for remote spin initialization that is readily transferable to a wide range of spin-based quantum architectures.
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