Universal quantum control of an atomic spin qubit on a surface

Wang, Yu; Haze, Masahiro; Bui, Hong T.; Soe, We‐Hyo; Aubin, H.; Ardavan, Arzhang; Heinrich, Andreas; Phark, Soo-hyon

doi:10.1038/s41534-023-00716-6

Cited by 8 publications

(3 citation statements)

References 34 publications

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“…These eigenstates, called dressed states, are labeled | D ⟩ in Figure d. The energy splitting Δ f between a pair of dressed states corresponds to the Rabi rate Ω, , determined by the coupling strength between the two-level system and the driving field . Our specific design of the double resonance ESR schemes for a coupled spin system allows such dressed states to be spectroscopically probed by another transition to a state, which does not undergo state dressing (e.g., |01⟩ in Figure d).…”

Section: Resultsmentioning

confidence: 99%

All-Electrical Driving and Probing of Dressed States in a Single Spin

Bui,

Wolf,

Wang

et al. 2024

ACS Nano

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The subnanometer distance between tip and sample in a scanning tunneling microscope (STM) enables the application of very large electric fields with a strength as high as ∼1 GV/m. This has allowed for efficient electrical driving of Rabi oscillations of a single spin on a surface at a moderate radiofrequency (RF) voltage on the order of tens of millivolts. Here, we demonstrate the creation of dressed states of a single electron spin localized in the STM tunnel junction by using resonant RF driving voltages. The read-out of these dressed states was achieved all electrically by a weakly coupled probe spin. Our work highlights the strength of the atomic-scale geometry inherent to the STM that facilitates the creation and control of dressed states, which are promising for the design of atomic scale quantum devices using individual spins on surfaces.

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Section: Resultsmentioning

confidence: 99%

All-Electrical Driving and Probing of Dressed States in a Single Spin

Bui,

Wolf,

Wang

et al. 2024

ACS Nano

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“…This makes it the most widely employed approach, especially in electron spin resonance scanning tunneling microscopy (ESR-STM) [8][9][10], an emerging technique capable of detecting single spin precession that is increasingly gaining popularity. The typical value of atoms to create the magnetic tip varies, but usually lies between 1 to 6 atoms [11][12][13]. Once this is accomplished, the resulting few-atoms cluster can be magnetized in an external magnetic field in a certain direction.…”

Section: Introductionmentioning

confidence: 99%

“…by unintentionally picking up another atom from the surface. Such tips have been employed in the study of ESR in STM of Fe, Ti, Na 2 dimers, Fe-phthalocyanine molecules just to name a few [11][12][13][14][15]. A common feature of such tips that has been reported in various publications is that the tip possesses two orthogonal ('up' , 'down') magnetic states [16,17].…”

Section: Introductionmentioning

confidence: 99%

On the magnetic bistability of small iron clusters used in scanning tunneling microscopy tip preparation

Yu,

Urdaniz,

Namgoong

et al. 2023

New J. Phys.

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The combination of electron spin resonance with scanning tunneling microscopy has resulted in a unique surface probe with sub-nm spatial and neV energy resolution. The preparation of a stable magnetic microtip is of central importance, yet, at the same time remains one of the hardest tasks. In this work, we rationalize why creating such microtips by picking up a few iron atoms often results in magnetically stable probes with two distinct magnetic states. By using density functional theory, we show that randomly formed clusters of five iron atoms can exhibit this behavior with magnetic anisotropy barriers of up to 73 meV. We explore the dependence of the magnetic behavior of such clusters on the geometrical arrangement and find a strong correlation between magnetic and geometric anisotropy—the less regular the cluster the higher its magnetic anisotropy barrier. Finally, our work rationalizes the experimental strategy of obtaining stable magnetic microtips.

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Electric‐Field‐Driven Spin Resonance by On‐Surface Exchange Coupling to a Single‐Atom Magnet

et al. 2023

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Coherent control of individual atomic and molecular spins on surfaces has recently been demonstrated by using electron spin resonance (ESR) in a scanning tunneling microscope (STM). Here, a combined experimental and modeling study of the ESR of a single hydrogenated Ti atom that is exchange‐coupled to a Fe adatom positioned 0.6–0.8 nm away by means of atom manipulation is presented. Continuous wave and pulsed ESR of the Ti spin show a Rabi rate with two contributions, one from the tip and the other from the Fe, whose spin interactions with Ti are modulated by the radio‐frequency electric field. The Fe contribution is comparable to the tip, as revealed by its dominance when the tip is retracted, and tunable using a vector magnetic field. The new ESR scheme allows on‐surface individual spins to be addressed and coherently controlled without the need for magnetic interaction with a tip. This study establishes a feasible implementation of spin‐based multi‐qubit systems on surfaces.

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Universal quantum control of an atomic spin qubit on a surface

Cited by 8 publications

References 34 publications

All-Electrical Driving and Probing of Dressed States in a Single Spin

All-Electrical Driving and Probing of Dressed States in a Single Spin

On the magnetic bistability of small iron clusters used in scanning tunneling microscopy tip preparation

Electric‐Field‐Driven Spin Resonance by On‐Surface Exchange Coupling to a Single‐Atom Magnet

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