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Proceedings Paper

A single-photon subtractor for multimode quantum states (Conference Presentation)
Author(s): Nicolas Treps; Clément Jacquard; Young Sik Ra; Jonathan D. Roslund; Adrien Dufour; Claude Fabre
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Paper Abstract

The nature of a quantum network, in particular in the continuous variable regime, is governed not only by the light quantum state but also by the measurement process. It can then be chosen after the light source has been generated. Multimode entanglement is not anymore an intrinsic property of the source but a complex interplay between source, measurement and eventually post processing. This new avenue paves the way for adaptive and scalable quantum information processing. However, to reach this ambitious goal, multimode degaussification has to be implemented. Single-photon subtraction and addition have proved to be such key operations, but are usually performed with linear optics elements on single-mode resources. We present a device able to perform mode dependant non Gaussian operation on a spectrally multimode squeezed vacuum states. Sum frequency generation between the state and a bright control beam whose spectrum has been engineered through ultrafast pulse-shaping is performed. The detection of a single converted photon heralds the success of the operation. The resulting multimode quantum state is analysed with standard homodyne detection whose local oscillator spectrum is independently engineered. The device can be characterized through quantum process tomography using weak multimode coherent states as inputs. Its single-mode character can be quantified and its inherent subtraction modes can be measured. The ability to simultaneously control the state engineering and its detection ensures both flexibility and scalability in the production of highly entangled non-Gaussian quantum states.

Paper Details

Date Published: 2 June 2017
PDF: 1 pages
Proc. SPIE 10118, Advances in Photonics of Quantum Computing, Memory, and Communication X, 1011806 (2 June 2017); doi: 10.1117/12.2256360
Show Author Affiliations
Nicolas Treps, Univ. Pierre et Marie Curie (France)
Clément Jacquard, Univ. Pierre et Marie Curie (France)
Young Sik Ra, Univ. Pierre et Marie Curie (France)
Jonathan D. Roslund, Univ Pierre et Marie Curie (France)
Adrien Dufour, Univ. Pierre et Marie Curie (France)
Claude Fabre, Univ. Pierre et Marie Curie (France)


Published in SPIE Proceedings Vol. 10118:
Advances in Photonics of Quantum Computing, Memory, and Communication X
Zameer Ul Hasan; Philip R. Hemmer; Hwang Lee; Alan L. Migdall, Editor(s)

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