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Quantum noise reduction in intensity-sensitive surface-plasmon-resonance sensors
Lee, Joong-Sung,Huynh, Trung,Lee, Su-Yong,Lee, Kwang-Geol,Lee, Jinhyoung,Tame, Mark,Rockstuhl, Carsten,Lee, Changhyoup American Physical Society 2017 Physical Review A Vol.96 No.3
<P>We investigate the use of twin-mode quantum states of light with symmetric statistical features in their photon number for improving intensity-sensitive surface plasmon resonance (SPR) sensors. For this purpose, one of the modes is sent into a prism setup where the Kretschmann configuration is employed as a sensing platform and the analyte to be measured influences the SPR excitation conditions. This influence modifies the output state of light that is subsequently analyzed by an intensity-difference measurement scheme. We show that quantum noise reduction is achieved not only as a result of the sub-Poissonian statistical nature of a single mode, but also as a result of the nonclassical correlation of the photon number between the two modes. When combined with the high sensitivity of the SPR sensor, we show that the use of twin-mode quantum states of light notably enhances the estimation precision of the refractive index of an analyte. With this we are able to identify a clear strategy to further boost the performance of SPR sensors, which are already a mature technology in biochemical and medical sensing applications.</P>
Multisetting Greenberger-Horne-Zeilinger theorem
Ryu, Junghee,Lee, Changhyoup,Yin, Zhi,Rahaman, Ramij,Angelakis, Dimitris G.,Lee, Jinhyoung,Ż,ukowski, Marek American Physical Society 2014 Physical review. A. Atomic, molecular, and optical Vol.89 No.2
We present a generalized Greenberger-Horne-Zeilinger (GHZ) theorem, which involves more than two local measurement settings for some parties, and cannot be reduced to one with less settings. Our results hold for an odd number of parties. We use a set of observables, which are incompatible but share a common eigenstate, here a GHZ state. Such observables are called concurrent. The idea is illustrated with an example of a three-qutrit system and then generalized to systems of higher dimensions, and more parties. The GHZ paradoxes can lead to, e.g., secret sharing protocols.