Quantum efficiency of binary-outcome detectors of solid-state qubits

2008/06/23 by Alexander N. Korotkov · 1 citation
Computer Science · Mathematics · Physics and Astronomy · #Arithmetic #Binary number #Combinatorics #Detector #Imperfect #Mathematics #Optics #Physics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum mechanics #Qubit #Topology (electrical circuits) #cond-mat.other #quant-ph

paper · pdf · doi:10.1103/physrevb.78.174512

published as Phys. Rev. B 78, 174512 (2008) · 11 pages

arxiv created 2008/06/23 · openalex publication_date 2008/11/12 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We introduce definitions of the quantum efficiency for binary-outcome qubit detectors with imperfect fidelity, focusing on the subclass of quantum nondemolition detectors. Quantum efficiency is analyzed for several models of detectors, including indirect projective measurement, linear detector in binary-outcome regime, detector of the superconducting phase qubit, and detector based on tunneling into continuum.

Citations

• Dynamics of a mesoscopic charge quantum bit under continuous quantum measurement
• Quantum measurements performed with a single-electron transistor
• RF-Driven Josephson Bifurcation Amplifier for Quantum Measurement
• Quantum-limited measurement and information in mesoscopic detectors
• Observation of Quantum Oscillations between a Josephson Phase Qubit and a Microscopic Resonator Using Fast Readout
• Quantum theory of optical feedback via homodyne detection
• Quantum-state engineering with Josephson-junction devices
• Quantum nondemolition measurement of a kicked qubit
• Quantum limits on noise in linear amplifiers

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