Cross-Kerr non-linearities for quantum non-demolition measurement
Duration: 47 mins 53 secs
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| Description: |
Stace, T (University of Queensland)
Wednesday 06 August 2014, 09:45-10:25 |
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| Created: | 2014-08-12 17:08 |
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| Collection: | Quantum Control Engineering: Mathematical Principles and Applications |
| Publisher: | Isaac Newton Institute |
| Copyright: | Stace, T |
| Language: | eng (English) |
| Abstract: | Various proposals exist that exploit cross-Kerr non-linearities between electromagnetic fields, for quantum non-demolition (QND) measurements, and other related protocols. Typically, these proposals assume the existence of such non-linearities, based on a presumption that the internal dynamics of the medium can be eliminated from the problem. I will discuss some recent work in which we explicitly include the medium. We show that homodyne detection of a probe field, plus classical signal processing, is sufficient to yield an itinerant microwave photon counter with fidelities above 90%. Our analysis has implications for the validity of a wider range of proposed cross-Kerr based quantum information protocols, which may need revision in consequence. |
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