Minimising quantum back action noise in quantum state tomography of cavities
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Minimising Quantum Back-Action Noise in Quantum State Tomography of Cavities. Bence Börcsök Mentors : Rana Adhikari , Yanbei Chen and Nicolas Smith-Lefebvre. Quantum Tomography. Reconstructing the quantum state of the system Deduce the Wigner-function. Broadband cavity.

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Minimising Quantum Back-Action Noise in Quantum State Tomography of Cavities

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Minimising Quantum Back-Action Noise in Quantum State Tomography of Cavities

Bence Börcsök

Mentors: RanaAdhikari, YanbeiChenand Nicolas Smith-Lefebvre


Quantum Tomography

  • Reconstructing the quantum state of the system

  • DeducetheWigner-function


Broadbandcavity


Cavitywithfinitebandwidth


Homodynedetection


Homodynedetection

Outgoingopticalfield:Local oscillator:Photocurrent:Signal:


Normalisation

We want:Constraints:


Resultso far


Furtherwork

  • Calculatingthefullfilteringfunctionforboth quadratures

  • Obtainingthecovariancematrix

  • Comparingresultswithactualexperiments


Acknowledgements

  • RanaAdhikari, YanbeiChenand Nicolas Smith-Lefebvre

  • BassamHelou

  • Michael Coughlin

  • Alan Weinstein


General method


Solutioninthefrequencydomain


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