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Related Experiment Video

Updated: Jun 21, 2026

Scanning-probe Single-electron Capacitance Spectroscopy

Scanning-probe Single-electron Capacitance Spectroscopy

Published on: July 30, 2013

Universal detector efficiency of a mesoscopic capacitor.

Simon E Nigg¹, Markus Büttiker

¹Département de Physique Théorique, Université de Genève, CH-1211 Genève 4, Switzerland. simon.nigg@unige.ch

Physical Review Letters

|August 8, 2009

Summary

We theoretically demonstrate a new high-frequency quantum detector for reading out double quantum dot charge qubits. This mesoscopic capacitor detector achieves near quantum-limited efficiency in the GHz regime.

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Area of Science:

Quantum Computing
Mesoscopic Physics
Quantum Information Science

Background:

A novel mesoscopic capacitor detector has been experimentally realized.
This detector comprises a quantum dot connected to a single lead via a quantum point contact.

Purpose of the Study:

To theoretically investigate a novel high-frequency quantum detector.
To demonstrate the readout of a double quantum dot charge qubit using this detector.

Main Methods:

Theoretical investigation of a mesoscopic capacitor.
Analysis of capacitive coupling between a double quantum dot charge qubit and the detector.
Calculation of readout efficiency in the GHz frequency regime.

Main Results:

The detector can readout the state of a double quantum dot charge qubit.
Readout is achieved in the GHz frequency regime with near quantum-limited efficiency.
The quantum efficiency exhibits universality due to the charge relaxation resistance of the mesoscopic capacitor.

Conclusions:

The mesoscopic capacitor serves as a highly efficient, high-frequency quantum detector.
The universality of its charge relaxation resistance ensures near quantum-limited readout efficiency.
This work paves the way for advanced quantum information processing applications.