Spectral investigation of the noise influencing multi-qubit states
arXiv:1608.04292 · doi:10.1103/PhysRevA.94.062334
Abstract
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.
arXiv comment8 pages, 10 figures
References in corpus (17)
- Decoherence Free Subspaces for Quantum Computation
- Dynamical Decoupling of Open Quantum Systems
- Reliable Quantum Computers
- Keeping a Quantum Bit Alive by Optimized -Pulse Sequences
- Experimental Quantum Error Correction
- How to Enhance Dephasing Time in Superconducting Qubits
- Universal Fault-Tolerant Computation on Decoherence-Free Subspaces
- Universal dynamical control of quantum mechanical decay: Modulation of the coupling to the continuum
- Dynamical decoupling noise spectroscopy
- Magnetic field sensing beyond the standard quantum limit using 10-spin NOON states
- Dynamical decoupling sequence construction as a filter-design problem
- Qubit noise spectroscopy for non-Gaussian dephasing environments
- Measurement of the Noise Spectrum Using a Multiple-Pulse Sequence
- Optimal pulse spacing for dynamical decoupling in the presence of a purely-dephasing spin-bath
- Optimized Dynamical Decoupling for Power Law Noise Spectra
- Dynamical decoupling sequences for multi-qubit dephasing suppression and long-time quantum memory
- Engineered Decoherence: Characterization and Suppression
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