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Paper 1
Nonadditive quantum error-correcting code
Sixia Yu, Qing Chen, C. H. Lai, C. H. Oh
- Year
- 2007
- Journal
- arXiv preprint
- DOI
- arXiv:0704.2122
- arXiv
- 0704.2122
We report the first nonadditive quantum error-correcting code, namely, a $((9,12,3))$ code which is a 12-dimensional subspace within a 9-qubit Hilbert space, that outperforms the optimal stabilizer code of the same length by encoding more levels while correcting arbitrary single-qubit errors.
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Single-spin spectroscopy of spontaneous and phase-locked spin torque oscillator dynamics
Adrian Solyom, Michael Caouette-Mansour, Brandon Ruffolo, Patrick Braganca, Lilian Childress, Jack Sankey
- Year
- 2023
- Journal
- arXiv preprint
- DOI
- arXiv:2307.16049
- arXiv
- 2307.16049
We employ N-$V$ magnetometry to measure the stray field dynamics of a ferromagnetic permalloy nanowire driven by spin-orbit torques. Specifically, we observe the optically detected magnetic resonance (ODMR) signatures of both spontaneous DC-driven magnetic oscillations and phase-locking to a second harmonic drive, developing a simple macrospin model that captures the salient features. We also observe signatures of dynamics beyond the macrospin model, including an additional ODMR feature (associated with a second SW mode) and one mode sapping power from another. Our results provide additional insight into N-$V$-spin wave coupling mechanisms, and represent a new modality for sub-wavelength N-$V$ scanned probe microscopy of nanoscale magnetic oscillators.
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