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Enhancing quantum sensing sensitivity by a quantum memory.

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 (13)C nuclear spins.

SUBMITTER: Zaiser S

PROVIDER: S-EPMC4987521 | biostudies-literature | 2016 Aug

REPOSITORIES: biostudies-literature

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Enhancing quantum sensing sensitivity by a quantum memory.

Zaiser Sebastian S Rendler Torsten T Jakobi Ingmar I Wolf Thomas T Lee Sang-Yun SY Wagner Samuel S Bergholm Ville V Schulte-Herbrüggen Thomas T Neumann Philipp P Wrachtrup Jörg J

Nature communications 20160810

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 w ...[more]

PMID: 27506596

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