Addressable electron spin resonance using donors and donor molecules in silicon.

Autor:	Hile SJ; Centre for Quantum Computation and Communication Technology (CQCT), School of Physics, University of New South Wales, Sydney, New South Wales 2052, Australia., Fricke L; Centre for Quantum Computation and Communication Technology (CQCT), School of Physics, University of New South Wales, Sydney, New South Wales 2052, Australia., House MG; Centre for Quantum Computation and Communication Technology (CQCT), School of Physics, University of New South Wales, Sydney, New South Wales 2052, Australia., Peretz E; Centre for Quantum Computation and Communication Technology (CQCT), School of Physics, University of New South Wales, Sydney, New South Wales 2052, Australia., Chen CY; Network for Computational Nanotechnology, Purdue University, West Lafayette, IN 47907, USA., Wang Y; Network for Computational Nanotechnology, Purdue University, West Lafayette, IN 47907, USA., Broome M; Centre for Quantum Computation and Communication Technology (CQCT), School of Physics, University of New South Wales, Sydney, New South Wales 2052, Australia., Gorman SK; Centre for Quantum Computation and Communication Technology (CQCT), School of Physics, University of New South Wales, Sydney, New South Wales 2052, Australia., Keizer JG; Centre for Quantum Computation and Communication Technology (CQCT), School of Physics, University of New South Wales, Sydney, New South Wales 2052, Australia., Rahman R; Network for Computational Nanotechnology, Purdue University, West Lafayette, IN 47907, USA., Simmons MY; Centre for Quantum Computation and Communication Technology (CQCT), School of Physics, University of New South Wales, Sydney, New South Wales 2052, Australia.
Jazyk:	angličtina
Zdroj:	Science advances [Sci Adv] 2018 Jul 13; Vol. 4 (7), pp. eaaq1459. Date of Electronic Publication: 2018 Jul 13 (Print Publication: 2018).
DOI:	10.1126/sciadv.aaq1459
Abstrakt:	Phosphorus donor impurities in silicon are a promising candidate for solid-state quantum computing due to their exceptionally long coherence times and high fidelities. However, individual addressability of exchange coupled donors with separations ~15 nm is challenging. We show that by using atomic precision lithography, we can place a single P donor next to a 2P molecule 16 ± 1 nm apart and use their distinctive hyperfine coupling strengths to address qubits at vastly different resonance frequencies. In particular, the single donor yields two hyperfine peaks separated by 97 ± 2.5 MHz, in contrast to the donor molecule that exhibits three peaks separated by 262 ± 10 MHz. Atomistic tight-binding simulations confirm the large hyperfine interaction strength in the 2P molecule with an interdonor separation of ~0.7 nm, consistent with lithographic scanning tunneling microscopy images of the 2P site during device fabrication. We discuss the viability of using donor molecules for built-in addressability of electron spin qubits in silicon.
Databáze:	MEDLINE
Externí odkaz:	Zobrazit plný text záznamu