Spin Readout and Initialization in a Semiconductor Quantum Dot

TL;DR

This paper proposes a novel method for spin readout and initialization in semiconductor quantum dots by converting spin information to orbital information via microwave excitation, enabling rapid and integrated quantum operations.

Contribution

It introduces a new spin-charge transduction scheme within a single quantum dot, enhancing measurement and control of electron spins in silicon.

Findings

Feasibility confirmed through detailed silicon device modeling

The scheme allows rapid spin initialization and readout

Potential for integrated quantum dot operations

Abstract

Electron spin qubits in semiconductors are attractive from the viewpoint of long coherence times. However, single spin measurement is challenging. Several promising schemes incorporate ancillary tunnel couplings that may provide unwanted channels for decoherence. Here, we propose a novel spin-charge transduction scheme, converting spin information to orbital information within a single quantum dot by microwave excitation. The same quantum dot can be used for rapid initialization, gating, and readout. We present detailed modeling of such a device in silicon to confirm its feasibility.