2016/08/31 by Deepak Khurana, Govind Unnikrishnan, T. S. Mahesh · 1 citation
Chemistry · Physics and Astronomy · #Advanced NMR Techniques and Applications #Coherence (philosophical gambling strategy) #Computer science #Condensed matter physics #Dynamical decoupling #Homonuclear molecule #Molecular spectroscopy and chirality #NMR spectroscopy and applications #Noise (video) #Physics #Quantum #Quantum decoherence #Quantum mechanics #Quantum noise #Qubit #Spins #quant-ph
paper · pdf · doi:10.1103/physreva.94.062334
published as Phys. Rev. A 94, 062334 (2016) · 8 pages, 10 figures
openalex publication_date 2016/12/27 · arxiv created 2017/01/04 · arxiv updated 2017/01/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Characterizing and understanding noise affecting quantum states has immense benefits in spectroscopy as well as in realizing quantum devices. Transverse relaxation times under a set of dynamical decoupling (DD) sequences with varying interpulse delays were earlier used for obtaining the noise spectral densities of single-qubit coherences. In this work, using a pair of homonuclear spins and NMR techniques, we experimentally characterize noise in certain decoherence-free subspaces. We also explore the noise of similar states in a heteronuclear spin pair. Further, using a 10-qubit system, we investigate noise profiles of various multiqubit coherences and study the scaling of noise with respect to the coherence order. Finally, using the experimentally obtained noise spectrum of the 10-qubit NOON state, we predict the performance of a Uhrig DD sequence and verify it experimentally.