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24.40.+h High efficiency sources

Precise ultra fast single qubit control using optimal control pulses

Thu, 2014-11-27 12:52 - Mattia Giardini
Date: 
2014-09-01
Author(s): 

J. Scheuer, Xi Kong, R. S. Said, J. Chen, A. Kurz, L. Marseglia, J. Du, P. R. Hemmer, S. Montangero, T. Calarco, B. Naydenov, F. Jelezko

Reference: 

Journal reference: New J. Phys. 16, 093022 (2014)
DOI: 10.1088/1367-2630/16/9/093022

URL: 

http://arxiv.org/abs/1309.4399

Ultra fast and accurate quantum operations are required in many modern scientific areas - for instance quantum information, quantum metrology and magnetometry. However the accuracy is limited if the Rabi frequency is comparable with the transition frequency due to the breakdown of the rotating wave approximation (RWA). Here we report the experimental implementation of a method based on optimal control theory, which does not suffer these restrictions.

Interfacing GHz-bandwidth heralded single photons with a room-temperature Raman quantum memory

Tue, 2014-05-27 00:12 - Josh Nunn
Date: 
2014-05-27
Author(s): 

P. S. Michelberger, T. F. M. Champion, M. R. Sprague, K. T. Kaczmarek, M. Barbieri, X. M. Jin, D. G. England, W. S. Kolthammer, D. J. Saunders, J. Nunn, I. A. Walmsley

Reference: 

quant-ph > arXiv:1405.1470

URL: 

http://arxiv.org/abs/1405.1470

Photonics is a promising platform for quantum technologies. However, photon sources and two-photon gates currently only operate probabilistically. Large-scale photonic processing will therefore be impossible without a multiplexing strategy to actively select successful events.

Broadband single-photon-level memory in a hollow-core photonic crystal fibre

Tue, 2014-05-27 00:07 - Josh Nunn
Date: 
2014-05-26
Author(s): 

M. R. Sprague, P. S. Michelberger, T. F. M. Champion, D. G. England, J. Nunn, X.-M. Jin, W. S. Kolthammer, A. Abdolvand, P. St. J. Russell & I. A. Walmsley

Reference: 

Nature Photonics 8, 287–291 (2014)

doi:10.1038/nphoton.2014.45

URL: 

http://www.nature.com/nphoton/journal/v8/n4/abs/nphoton.2014.45.html

Storing information encoded in light is critical for realizing optical buffers for all-optical signal processing

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