A quantum spectrum analyzer enhanced by a nuclear spin memory
At a Glance
Section titled “At a Glance”| Metadata | Details |
|---|---|
| Publication Date | 2017-08-22 |
| Journal | npj Quantum Information |
| Authors | T. Rosskopf, Jonathan Zopes, J. M. Boss, Christian L. Degen |
| Institutions | ETH Zurich |
| Citations | 68 |
Abstract
Section titled “Abstract”Abstract We realize a two-qubit sensor designed for achieving high-spectral resolution in quantum sensing experiments. Our sensor consists of an active “sensing qubit” and a long-lived “memory qubit”, implemented by the electronic and the nitrogen-15 nuclear spins of a nitrogen-vacancy center in diamond, respectively. Using state storage times of up to 45 ms, we demonstrate spectroscopy of external ac signals with a line width of 19 Hz (∼2.9 ppm) and of carbon-13 nuclear magnetic resonance signals with a line width of 190 Hz (∼74 ppm). This represents an up to 100-fold improvement in spectral resolution compared to measurements without nuclear memory.