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Quantum optimal measurements for clocks and microscopes

Date:  Thursday, October 25th, 2018

Time: 4:00pm

Location: 100 Willamette Hall

Speaker: Mark Kasevich, Stanford

Abstract:

When and how can quantum entanglement be exploited as a resource to improve measurement precision?

This talk will discuss this question in the context of two sensing scenarios:  i) precision atomic clocks [1] and ii) phase contrast optical and electron microscopy [2].  In the first case, massively entangled atomic states have been exploited to realize nearly 20 dB metrological improvement in atomic clock precision.  In the second, quantum optimal performance is obtained without entanglement, but rather through the use of a mulit-pass measurement protocol.   In either case, quantum optimal measurements show promise of enabling a new generation of sensors with at least 10-fold improved performance.  Future applications, which include include low-damage imaging of nm-scale proteins and new tests of quantum mechanics and gravitation, will be described.

[1]  Hosten, O., et al.  “Measurement Noise 100 Times Lower than the Quantum-Projection Limit Using Entangled Atoms.” Nature 529 (Jan. 2016).

[2]  Juffmann, T., et al., “Multi-Pass Microscopy.” Nature Communications 7 (Sept. 2016).

Host:  Benjamin McMorran

All attendees are invited to attend a colloquium reception in the Willamette Hall, Paul Olum atrium at 3:40pm.

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