Abstract
Traditional approaches to controlling single spins in quantum dots require the generation of large electromagnetic fields to drive many Rabi oscillations within the spin coherence time. We demonstrate "flopping-mode" electric dipole spin resonance, where an electron is electrically driven in a Si/SiGe double quantum dot in the presence of a large magnetic field gradient. At zero detuning, charge delocalization across the double quantum dot enhances coupling to the drive field and enables low power electric dipole spin resonance. Through dispersive measurements of the single electron spin state, we demonstrate a nearly three order of magnitude improvement in driving efficiency using flopping-mode resonance, which should facilitate low power spin control in quantum dot arrays.
Highlights
Traditional approaches to controlling single spins in quantum dots require the generation of large electromagnetic fields to drive many Rabi oscillations within the spin coherence time
As spin systems are scaled beyond a few qubits, methods of spin control which minimize dissipation and reduce qubit crosstalk will be important for low-temperature quantum information processing [12]
Tially varying Zeeman splitting, enabling spins in neighboring quantum dots (QDs) to be selectively addressed [11,19,21,22,23,24,25]. In this Rapid Communication, we demonstrate a mechanism for driving low-power, coherent spin rotations, which we call “flopping-mode Electric dipole spin resonance (EDSR).”
Summary
Traditional approaches to controlling single spins in quantum dots require the generation of large electromagnetic fields to drive many Rabi oscillations within the spin coherence time. In this Rapid Communication, we demonstrate a mechanism for driving low-power, coherent spin rotations, which we call “flopping-mode EDSR.” In conventional EDSR, the electric drive field couples to a charge trapped in a single quantum dot, leading to a relatively small electronic displacement [16]. We instead drive single spin rotations in a DQD close to zero detuning, = 0, where the electric field can force the electron to flop back and forth between the left and right dots in the “flopping mode,” thereby sampling a larger variation in transverse magnetic field.
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