Informationen für

Direkt zu


 

Quantum sensing of weak GHz frequency fields – towards a microwave single photon detector

Quantum sensing of weak GHz frequency fields – towards a microwave single photon detector

Datum: 25. April 2017 13:00

Ort: NWZII, 6.331

Solid state qubits, such as the Nitrogen-Vacancy (NV) center in
diamond, have become powerful sensors for nanoscale magnetic and
electric fields. A major key for their success have been dynamical
decoupling protocols, which efficiently pick up tiny alternating (AC) signals.
Currently, those methods are limited to signal frequencies up to several
MHz.
I will present a novel dynamical decoupling protocol specifically designed to
detect weak fields close to the NV's transition frequency (~2 GHz).
It exploits a quantum-optical effect, the Mollow triplet splitting
of a strongly driven two-level system. We microscopically understand
this effect as a pulsed dynamical decoupling protocol and find that it
enables sensitive detection of fields close to the driven transition.
Employing a nitrogen-vacancy center, we detect GHz microwave fields
with a signal strength (Rabi frequency) below the current detection
limit, which is set by the center’s spectral linewidth 1/T2*.
I will speculate on possible applications, in particular spin-phonon
coupling and detection of single microwave photons in superconducting
circuits.

<< Zurück