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Updated: Aug 24, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
Published on: May 30, 2014
Where is the shot noise of a quantum point contact?
Frederick Green1, Jagdish S Thakur, Mukunda P Das
1Department of Theoretical Physics, Institute of Advanced Studies, The Australian National University, Canberra, ACT 0200, Australia.
Abstract:
Reznikov et al. [Phys. Rev. Lett. 75, 3340 (1995)]] have presented definitive observations of nonequilibrium noise in a quantum point contact. Especially puzzling is the "anomalous" peak structure of the excess noise measured at constant current; to date it remains unexplained. We show that their experiment directly reveals the deep link between conservation principles in the electron gas and its low-dimensional, mesoscopic behavior. The keys to that connection are gauge invariance and the compressibility sum rule. These are central not only to the experiment of Reznikov et al., but to the very nature of all mesoscopic transport.
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