Journal
PHYSICAL REVIEW LETTERS
Volume 113, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.113.023602
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Funding
- National Basic Research Program of China (973 Program) [2011CB921604]
- National Natural Science Foundation of China [11374104, 10974057, 11234003]
- SRFDP [20130076110011]
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning
- Program for New Century Excellent Talents in University [NCET-10-0383]
- Shanghai Municipal Education Commission
- Shanghai Education Development Foundation [11SG26]
- Shanghai Pujiang Program [09PJ1404400]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry
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Quantum correlations and entanglement shared among multiple quantum modes are important for both fundamental science and the future development of quantum technologies. This development will also require an efficient quantum interface between multimode quantum light sources and atomic ensembles, which makes it necessary to implement multimode quantum light sources that match the atomic transitions. Here, we report on such a source that provides a method for generating quantum correlated beams that can be extended to a large number of modes by using multiple four-wave mixing (FWM) processes in hot rubidium vapor. Experimentally, we show that two cascaded FWM processes produce strong quantum correlations between three bright beams but not between any two of them. In addition, the intensity-difference squeezing is enhanced with the cascaded system to -7.0 +/- 0.1 dB from the -5.5 +/- 0.1/-4.5 +/- 0.1 dB squeezing obtained with only one FWM process. One of the main advantages of our system is that as the number of quantum modes increases, so does the total degree of quantum correlations. The proposed method is also immune to phase instabilities due to its phase insensitive nature, can easily be extended to multiple modes, and has potential applications in the production of multiple quantum correlated images.
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