Oscillator state reconstruction via tunable qubit coupling in Markovian environments

• Published in: arXiv.org
• Main Authors: Tufarelli, Tommaso, Kim, M S, Bose, Sougato
• Format: Paper Journal Article
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 12.09.2011
• Subjects: Characteristic functions; Coupling; Harmonic oscillators; Markov processes; Physics - Quantum Physics; Quadratures; Quantum theory; Qubits (quantum computing); Reconstruction; Superposition (mathematics)

We show that a parametrically coupled qubit can be used to fully reconstruct the quantum state of a harmonic oscillator, even when both systems are subject to decoherence. By controlling the coupling strength of the qubit over time, the characteristic function of the oscillator at any phase space po...