Coherent transport through a double donor system in silicon

TL;DR

This paper reports the observation of quantum interference between two donors in a silicon nano-MOSFET, demonstrating coherent electron exchange and tunable phase differences via magnetic fields, relevant for quantum computing.

Contribution

It provides experimental evidence of coherent transport and interference effects between donors in silicon, advancing understanding for donor-based quantum computing.

Findings

Observation of Fano resonance indicating interference

Demonstration of phase tuning with magnetic field

Evidence of coherent electron exchange between donors

Abstract

Quantum coherence is of crucial importance for the applicability of donor based quantum computing. In this Letter we describe the observation of the interference of conduction paths induced by two donors in a nano-MOSFET resulting in a Fano resonance. This demonstrates the coherent exchange of electrons between two donors. In addition, the phase difference between the two conduction paths can be tuned by means of a magnetic field, in full analogy to the Aharonov-Bohm effect.