Transmission phase read-out of a large quantum dot in a nanowire interferometer

Abstract

Detecting the transmission phase of a quantum dot via interferometry can reveal the symmetry of the orbitals and details of electron transport. Crucially, interferometry will enable the read-out of topological qubits based on one-dimensional nanowires. However, measuring the transmission phase of a quantum dot in a nanowire has not yet been established. Here, we exploit recent breakthroughs in the growth of one-dimensional networks and demonstrate interferometric read-out in a nanowire-based architecture. In our two-path interferometer, we define a quantum dot in one branch and use the other path as a reference arm. We observe Fano resonances stemming from the interference between electrons that travel through the reference arm and undergo resonant tunnelling in the quantum dot. Between consecutive Fano peaks, the transmission phase exhibits phase lapses that are affected by the presence of multiple trajectories in the interferometer. These results provide critical insights for the design of future topological qubits.

to be published in Nature Communications

References in corpus (6)

• Majorana Fermions and a Topological Phase Transition in Semiconductor-Superconductor Heterostructures
• Supercurrent reversal in quantum dots
• Majorana box qubits
• Braiding without Braiding: Teleportation-Based Quantum Information Processing with Majorana Zero Modes
• Mesoscopic to universal crossover of transmission phase of multi-level quantum dots
• Non-universal transmission phase behaviour of a large quantum dot

Cited by in corpus (2)

• Quantum coherence-control of thermal energy transport: The V model as a case study
• Probing Majorana bound states through an inhomogeneous Andreev double dot interferometer