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

Abstract

We discuss definitions of the quantum efficiency for binary-outcome qubit detectors with imperfect fidelity, focusing on the subclass of quantum non-demolition 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.

11 pages

References in corpus (4)

• Resolving photon number states in a superconducting circuit
• Quantum-Limited Measurement and Information in Mesoscopic Detectors
• Quantum Nondemolition Measurement of a Kicked Qubit
• Coherence of a Josephson phase qubit under partial-collapse measurement

Cited by in corpus (1)

• Weak and strong measurement of a qubit using a switching-based detector