Quantum Measurements of Coupled Two-Level Systems

2009/02/28 by Leonid Fedichkin, Fedichkin, L., Michael Shapiro +3
Computer Science · Physics and Astronomy · #FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Quantum Information and Cryptography #Quantum Physics (quant-ph) #Quantum and electron transport phenomena #Spectroscopy and Quantum Chemical Studies

paper · pdf · doi:10.48550/arxiv.0903.0012

openalex publication_date 2009/02/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We propose an approach to measuring nonresonant coupled systems, which gives a parametrically smaller error than the conventional fast projective measurements. The approach takes into account that, due to the coupling, excitations are not entirely localized on individual systems. It combines high spectral selectivity of the detector with temporal resolution and uses the ideas of the quantum diffusion theory. The results bear on quantum computing with perpetually coupled qubits.

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