The Use of Exchange Coupled Atom Qubits as Atomic-Scale Magnetic Field Sensors

Kranz, Ludwik1,2; Gorman, Samuel K.1,2; Thorgrimsson, Brandur1,2; Monir, Serajum1,2; He, Yu1,2,3; Keith, Daniel1,2; Charde, Keshavi1,2; Keizer, Joris G.2; Rahman, Rajib1,2; Simmons, Michelle Y.1,2

2022-11-01

10.1002/adma.202201625

ADVANCED MATERIALS   影响因子和分区

0935-9648

1521-4095

Phosphorus atoms in silicon offer a rich quantum computing platform where both nuclear and electron spins can be used to store and process quantum information. While individual control of electron and nuclear spins has been demonstrated, the interplay between them during qubit operations has been largely unexplored. This study investigates the use of exchange-based operation between donor bound electron spins to probe the local magnetic fields experienced by the qubits with exquisite precision at the atomic scale. To achieve this, coherent exchange oscillations are performed between two electron spin qubits, where the left and right qubits are hosted by three and two phosphorus donors, respectively. The frequency spectrum of exchange oscillations shows quantized changes in the local magnetic fields at the qubit sites, corresponding to the different hyperfine coupling between the electron and each of the qubit-hosting nuclear spins. This ability to sense the hyperfine fields of individual nuclear spins using the exchange interaction constitutes a unique metrology technique, which reveals the exact crystallographic arrangements of the phosphorus atoms in the silicon crystal for each qubit. The detailed knowledge obtained of the local magnetic environment can then be used to engineer hyperfine fields in multi-donor qubits for high-fidelity two-qubit gates.

atomic electronics atomic sensors nanotechnology quantum computing qubits

SCI

英语

NI论文

其他

Australian Research Council Centre of Excellence for Quantum Computation and Communication Technology[CE170100012] ; US Army Research Office[W911NF-17-1-0202]

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter

WOS:000891968000001

WILEY-V C H VERLAG GMBH

MATERIALS SCIENCE

Web of Science

1.Univ New South Wales, Ctr Excellence Quantum Computat & Commun Technol, Sch Phys, Sydney, NSW 2052, Australia
2.UNSW, Silicon Quantum Comp Pty Ltd, Sydney 2052, Australia
3.Southern Univ Sci & Technol, Shenzhen Inst Quantum Sci & Engn, Shenzhen 518055, Peoples R China

Kranz, Ludwik,Gorman, Samuel K.,Thorgrimsson, Brandur,et al. The Use of Exchange Coupled Atom Qubits as Atomic-Scale Magnetic Field Sensors[J]. ADVANCED MATERIALS,2022,35(6).

Kranz, Ludwik.,Gorman, Samuel K..,Thorgrimsson, Brandur.,Monir, Serajum.,He, Yu.,...&Simmons, Michelle Y..(2022).The Use of Exchange Coupled Atom Qubits as Atomic-Scale Magnetic Field Sensors.ADVANCED MATERIALS,35(6).

Kranz, Ludwik,et al."The Use of Exchange Coupled Atom Qubits as Atomic-Scale Magnetic Field Sensors".ADVANCED MATERIALS 35.6(2022).