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

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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  1. Minimising Quantum Back-Action Noise in Quantum State Tomography of Cavities Bence Börcsök Mentors: RanaAdhikari, YanbeiChenand Nicolas Smith-Lefebvre

  2. Quantum Tomography • Reconstructing the quantum state of the system • DeducetheWigner-function

  3. Broadbandcavity

  4. Cavitywithfinitebandwidth

  5. Homodynedetection

  6. Homodynedetection Outgoingopticalfield:Local oscillator:Photocurrent:Signal:

  7. Normalisation We want:Constraints:

  8. Resultso far

  9. Furtherwork • Calculatingthefullfilteringfunctionforboth quadratures • Obtainingthecovariancematrix • Comparingresultswithactualexperiments

  10. Acknowledgements • RanaAdhikari, YanbeiChenand Nicolas Smith-Lefebvre • BassamHelou • Michael Coughlin • Alan Weinstein

  11. General method

  12. Solutioninthefrequencydomain

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