Time-bin qubit architecture using quantum Hall edge channels

TL;DR

This paper proposes a scalable quantum computing architecture using time-bin encoded qubits in quantum Hall edge channels, enabling robust qubit operations and multi-qubit entanglement through dynamic control and engineered interactions.

Contribution

It introduces a novel modular platform called TEMPO that encodes qubits in time-separated edge magnetoplasmon wave packets, simplifying coherence preservation and scalable quantum operations.

Findings

Demonstrates full qubit operation capabilities including initialization, phase modulation, and readout.

Describes strategies for waveform integrity and coherence preservation in EMP propagation.

Proposes methods for multi-qubit entanglement via synchronized injection and Coulomb interactions.

Abstract

We present the basic elements for a modular architecture for time-bin encoded qubits based on quantum Hall edge channels, forming the foundation of a scalable electronic quantum information platform named TEMPO (Time-binned Electronic Modular Platform for Qubits). Quantum states are encoded in temporally separated edge magnetoplasmon (EMP) wave packets propagating along a single chiral edge, eliminating the need for spatial path separation and enhancing coherence. The platform supports full qubit operations$\unicode{x2013}$including initialization, phase modulation, readout, and two-qubit entangling gates$\unicode{x2013}$by leveraging dynamically tunable quantum point contacts and electrostatic control of interferometric loops. We consider the linear dispersion and gate-induced velocity control on EMP propagation and describe strategies for maintaining waveform integrity. Various single-electron sources, including ohmic injection and capacitive excitation, are discussed in the context of coherence. Multi-qubit operations are enabled through synchronized injection and engineered Coulomb interactions between adjacent channels, while single-qubit readout is addressed via spin-based or capacitive charge sensors. Our approach integrates gate-tunable coherent control of chiral edge states, offering a comprehensive pathway toward scalable electron quantum optics in solid-state platforms.