Quantum measurement characteristics of double-dot single electron transistor

Abstract

Owing to a few unique advantages, double-dot single electron transistor has been proposed as an alternative detector for charge states. In this work, we present a further study for its signal-to-noise property, based on a full analysis of the setup configuration symmetry. It is found that the effectiveness of the double-dot detector can approach that of an ideal detector, if the symmetric capacitive coupling is taken into account. The quantum measurement efficiency is also analyzed, by comparing the measurement time with the measurement-induced dephasing time.

7 pages, 5 figures

References in corpus (8)

• Single-shot read-out of an individual electron spin in a quantum dot
• Quantum-Limited Measurement and Information in Mesoscopic Detectors
• Counting statistics and super-Poissonian noise in a quantum dot
• Spontaneous Relaxation of a Charge Qubit under Electrical Measurement
• Qubit measurements with a double-dot detector
• Noise and Measurement Efficiency of a Partially Coherent Mesoscopic Detector
• Theory of a double-dot charge detector
• Current suppression in a double-island single-electron transistor for detection of degenerate charge configurations of a floating double-dot

Cited by in corpus (6)

• Quantum mechanical approach to decoherence and relaxation generated by fluctuating environment
• Full Counting statistics of level renormalization in electron transport through double quantum dots
• Coherent quantum ratchets driven by tunnel oscillations: Fluctuations and correlations
• Reduced dynamics with renormalization in solid-state charge qubit measurement
• Weak Measurement of Qubit Oscillations with Strong Response Detectors: Violation of the Fundamental Bound Imposed on Linear Detectors
• Renormalized dynamics in charge qubit measurements by a single electron transistor