Measurement of the noise spectrum using a multiple-pulse sequence

Tatsuro Yuge, Susumu Sasaki, Yoshiro Hirayama

Research output: Contribution to journalArticlepeer-review

95 Citations (Scopus)


A method is proposed for obtaining the spectrum for noise that causes the phase decoherence of a qubit directly from experimentally available data. The method is based on a simple relationship between the spectrum and the coherence time of the qubit in the presence of a π pulse sequence. The relationship is found to hold for every system of a qubit interacting with the classical-noise, bosonic, and spin baths.

Original languageEnglish
Article number170504
JournalPhysical Review Letters
Issue number17
Publication statusPublished - 2011 Oct 18


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