Imperial College London
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Professor Myungshik Kim

Faculty of Natural Sciences, Department of Physics

Chair in Theoretical Quantum Information Sciences
 
 
 
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Contact

 

+44 (0)20 7594 7754m.kim

 
 
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Location

 

1202Electrical EngineeringSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Banchi:2018:10.1103/physrevlett.121.250402,
author = {Banchi, L and Kolthammer, WS and Kim, MS},
doi = {10.1103/physrevlett.121.250402},
journal = {Physical Review Letters},
title = {Multiphoton tomography with linear optics and photon counting},
url = {http://dx.doi.org/10.1103/physrevlett.121.250402},
volume = {121},
year = {2018}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Determining an unknown quantum state from an ensemble of identical systems is a fundamental, yet experimentally demanding, task in quantum science. Here we study the number of measurement bases needed to fully characterize an arbitrary multimode state containing a definite number of photons, or an arbitrary mixture of such states. We show this task can be achieved using only linear optics and photon counting, which yield a practical though nonuniversal set of projective measurements. We derive the minimum number of measurement settings required and numerically show that this lower bound is saturated with random linear optics configurations, such as when the corresponding unitary transformation is Haar random. Furthermore, we show that for N photons, any unitary 2N design can be used to derive an analytical, though nonoptimal, state reconstruction protocol.
AU  - Banchi,L
AU  - Kolthammer,WS
AU  - Kim,MS
DO  - 10.1103/physrevlett.121.250402
PY  - 2018///
SN  - 0031-9007
TI  - Multiphoton tomography with linear optics and photon counting
T2  - Physical Review Letters
UR  - http://dx.doi.org/10.1103/physrevlett.121.250402
UR  - http://hdl.handle.net/10044/1/65374
VL  - 121
ER  -
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