[quantum-info] IQC Seminar Thursday, May 30th, Alexandre Cooper-Roy

[Bronwyn Greavette]

IQC Seminar

Monday, 30 May 2013 at 2:00 PM
QNC 1201

Speaker: 
Alexandre Cooper-Roy
Massachusetts Institute of Technology 

Title:
Time-resolved magnetic sensing with electronic spins in diamond

Summary:
In this talk, I will describe a novel approach to measure time-varying fields with quantum probes. The reconstruction method relies on control sequences acting as digital filters expressed in the so called Walsh basis. I will also present proof-of-principle measurements of the magnetic field radiated by a physical model of a neuron using a single electronic spin in diamond.

Abstract:
Quantum probes enable the sensitive detection of time-varying fields with nanometer spatial
resolution. In particular, nitrogen-vacancy (NV) centers in diamond have recently emerged as
promising sensors of magnetic and electric fields. Although coherent control techniques
have measured the amplitude of constant or oscillating fields, these techniques are unable to measure
fields with unknown dynamics. Here we introduce a novel approach to accurately reconstruct the
arbitrary profile of time-varying fields using coherent control sequences associated with the Walsh
functions . These sequences act as digital filters that efficiently extract information about the
field dynamics while suppressing decoherence. We experimentally demonstrate our approach by
performing proof-of-principle reconstruction of the magnetic field radiated by a physical model of a
neuron using a single electronic spin in diamond. These results will be useful for performing time-resolved
magnetic sensing with quantum probes in a broad array of physical and biological systems

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