Enhancing quantum sensing sensitivity by a quantum memory

Sebastian Zaiser, Torsten Rendler, Ingmar Jakobi, Thomas Wolf, Sang-Yun Lee, Samuel Wagner, Ville Bergholm, Thomas Schulte-Herbrüggen, Philipp Neumann () and Jörg Wrachtrup
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Sebastian Zaiser: 3rd Physics Institute, University of Stuttgart
Torsten Rendler: 3rd Physics Institute, University of Stuttgart
Ingmar Jakobi: 3rd Physics Institute, University of Stuttgart
Thomas Wolf: 3rd Physics Institute, University of Stuttgart
Sang-Yun Lee: 3rd Physics Institute, University of Stuttgart
Samuel Wagner: 3rd Physics Institute, University of Stuttgart
Ville Bergholm: Technical University Munich
Thomas Schulte-Herbrüggen: Technical University Munich
Philipp Neumann: 3rd Physics Institute, University of Stuttgart
Jörg Wrachtrup: 3rd Physics Institute, University of Stuttgart

Nature Communications, 2016, vol. 7, issue 1, 1-11

Abstract: Abstract In quantum sensing, precision is typically limited by the maximum time interval over which phase can be accumulated. Memories have been used to enhance this time interval beyond the coherence lifetime and thus gain precision. Here, we demonstrate that by using a quantum memory an increased sensitivity can also be achieved. To this end, we use entanglement in a hybrid spin system comprising a sensing and a memory qubit associated with a single nitrogen-vacancy centre in diamond. With the memory we retain the full quantum state even after coherence decay of the sensor, which enables coherent interaction with distinct weakly coupled nuclear spin qubits. We benchmark the performance of our hybrid quantum system against use of the sensing qubit alone by gradually increasing the entanglement of sensor and memory. We further apply this quantum sensor-memory pair for high-resolution NMR spectroscopy of single 13C nuclear spins.

Date: 2016
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DOI: 10.1038/ncomms12279

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