Our quantum-optics effort currently focuses on superconducting nanowire single-photon detector (SNSPDs) can work in free running mode with high detection efficiency, low dark counts rate, high speed and low jitter. These unique properties make SNSPDs strong candidates for quantum optics. For example, we are using SNSPDs to measure the efficiency of a correlated photon-pair source. Using SNSPDs, such measurements can be many orders-of-magnitude faster than using other photodetectors (such as avalanche photodiodes working in Geiger mode).
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Our quantum computing effort currently focuses on developing superconductive ion traps. We are also developing superconducting electronic elements that can interact with ion traps or neutral-atomic systems to readout their internal quantum state. This is a new project in collaboration with Profs. Isaac Chuang, and we are currently seeking a post-doc interested in joining this team.
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Measuring intensity correlations with a two-element superconducting nanowire single photon detector
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A photon-number-resolving detector based on a four-element superconducting nanowire single photon detector is demonstrated to have a 25% system detection efficiency at 1550 nm and sub-30-ps resolution in measuring the arrival time of individual photons. This detector can be used to characterize the photon statistics of non-pulsed light sources and to mitigate dead-time effects in high-speed photon counting applications.
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Intensity correlations of a single quantum dot measured with a beamsplitter and two discrete SPADs and without a beamsplitter using a two-element SNSPD
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Eric A. Dauler, M.J. Stevens, B. Baek, R. Molnar, S.A. Hamilton, R.P. Mirin, S.-W. Nam, and Karl K. Berggren, Physical Review A,Vol. 78, 053826 (2008) (4 pages).[pdf] |
Collaborators
- Prof. I. Chuang
- Prof. J. H. Thywissen (Toronto
Ultracold Atoms Lab, U. of Toronto)
- NIST (Martin Steven, Burm Baek, Sae-Woo Nam)
- Prof. Jeffrey Shapiro and Dr. Franco Wong (MIT)
- Dr. Scott Hamilton (MIT)
Sponsors
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