Nuclear spin coherence in a quantum wire

Abstract

We have observed millisecond-long coherent evolution of nuclear spins in a quantum wire at 1.2 K. Local, all-electrical manipulation of nuclear spins is achieved by dynamic nuclear polarization in the breakdown regime of the Integer Quantum Hall Effect combined with pulsed Nuclear Magnetic Resonance. The excitation thresholds for the breakdown are significantly smaller than what would be expected for our sample and the direction of the nuclear polarization can be controlled by the voltage bias. As a four-level spin system, the device is equivalent to two qubits.

5 pages, 5 figures

References in corpus (11)

• Quantum Transport in Semiconductor Nanostructures
• Long-lived memory for mesoscopic quantum bits
• Interaction Effects in a One-Dimensional Constriction
• Coherence Time of a Solid-State Nuclear Qubit
• Tunable effective g-factor in InAs nanowire quantum dots
• Dynamic nuclear polarization at the edge of a two-dimensional electron gas
• Large nuclear Overhauser fields detected in vertically-coupled double quantum dots
• Quantum information processing with large nuclear spins in GaAs semiconductors
• Electrical polarization of nuclear spins in a breakdown regime of quantum Hall effect
• Electrical coherent control of nuclear spins in a breakdown regime of quantum Hall effect
• Electron correlation effects in a wide channel from the $\nu =1$ quantum Hall edge states

Cited by in corpus (8)

• Shot Noise in Mesoscopic Systems: from Single Particles to Quantum Liquids
• Shot Noise Induced by Electron-nuclear Spin-flip Scattering in a Nonequilibrium Quantum Wire
• Resistively-detected NMR lineshapes in a quasi-one dimensional electron system
• Nuclear Polarization in Quantum Point Contacts in an In-Plane Magnetic Field
• Probing strain modulation in a gate-defined one dimensional electron system
• Dynamic nuclear polarization at high Landau levels in a quantum point contact
• Landau level spin diode in a GaAs two dimensional hole system
• Two-step breakdown of a local v = 1 quantum Hall state