QSense OIST Mini-Symposium Talk 2: Cavity-enhanced magnetometer using a spinor Bose-Einstein condensate


Wednesday, February 3, 2021 - 17:00


Zoom (link is distributed to registered participants)


Speaker: Prof Thomas Busch, Okinawa Institute for Science and Technology (OIST) Graduate University

Cavity-enhanced magnetometer using a spinor Bose-Einstein condensate
(QSense OIST Mini Symposium Talk 2)​

We show how a composite light-matter magnetometer can be constructed using a transversely driven multi-component Bose-Einstein condensate coupled to two distinct electromagnetic modes of a linear cavity. Above the critical pump strength, the change of the population imbalance of the condensate caused by an external magnetic field entails the change of relative photon number of the two cavity modes and monitoring the cavity output fields allows for nondestructive measurement of the magnetic field in real time. The sensitivity of the proposed magnetometer exhibits Heisenberg-like scaling with respect to the atom number and for state-of-the-art experimental parameters the lower bound on the sensitivity of such a magnetometer can be shown to be of the order of fT/ \sqrt{Hz}—pT/ \sqrt{Hz} for typical experimental parameters.

OIST Mini-Symposium for Quantum Sensors of Magnetic and Inertial Forces

This mini-symposium is hosted by the Quantum Machines Unit in the Okinawa Institute of Science and Technology Graduate University, and will take place from Feb 1, 2021 - March 5, 2021. To get the precise schedule and zoom invitation please register below. Attendance is open to any student/faculty member from any of the institutions associated with the speakers.


Quantum systems are extremely fragile, sensitive to noise and fluctuations by their environments. This, in turn, makes them excellent sensors for a variety of forces and fields. In this mini-symposium we focus on the development of novel quantum sensors which are aimed at the precision sensing of inertial forces such as acceleration or gravity, and magnetic forces.

Such sensors - accelerometers/gravimeters or magnetometers, have a widespread application in industry such as sensing underground water movements using gravimeters, through to magnetic brain imaging using magnetoencephelography. Each week we hear from three international experts on these topics in hour-long seminars and discussions.

For more information, visit the QSense website.

Website URL

Sponsor or Contact: 
Quantum Machines Unit (Jason Twamley)
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