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{Thekkadath:2022:10.1103/PRXQuantum.3.020336,
author = {Thekkadath, G and Sempere-Llagostera, S and Bell, B and Patel, R and Kim, M and Walmsley, I},
doi = {10.1103/PRXQuantum.3.020336},
journal = {PRX Quantum},
title = {Experimental demonstration of Gaussian boson sampling with displacement},
url = {http://dx.doi.org/10.1103/PRXQuantum.3.020336},
volume = {3},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Gaussian boson sampling (GBS) is a quantum sampling task in which one has to draw samples from the photon-number distribution of a large-dimensional nonclassical squeezed state of light. In an effort to make this task intractable for a classical computer, experiments building GBS machines have mainly focused on increasing the dimensionality and squeezing strength of the nonclassical light. However, no experiment has yet demonstrated the ability to displace the squeezed state in phase space, which is generally required for practical applications of GBS. In this work, we build a GBS machine that achieves the displacement by injecting a laser beam alongside a two-mode squeezed vacuum state into a 15-mode interferometer. We focus on two new capabilities. Firstly, we use the displacement to reconstruct the multimode Gaussian state at the output of the interferometer. Our reconstruction technique is in situ and requires only three measurement settings regardless of the state dimension. Secondly, we study how the addition of classical laser light in our GBS machine affects the complexity of sampling its output photon statistics. We introduce and validate approximate semiclassical models that reduce the computational cost when a significant fraction of the detected light is classical.
AU  - Thekkadath,G
AU  - Sempere-Llagostera,S
AU  - Bell,B
AU  - Patel,R
AU  - Kim,M
AU  - Walmsley,I
DO  - 10.1103/PRXQuantum.3.020336
PY  - 2022///
SN  - 2691-3399
TI  - Experimental demonstration of Gaussian boson sampling with displacement
T2  - PRX Quantum
UR  - http://dx.doi.org/10.1103/PRXQuantum.3.020336
UR  - http://hdl.handle.net/10044/1/97086
VL  - 3
ER  -
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