Ulrik L Andersen et al 2002 J. Opt. B: Quantum Semiclass. Opt. 4 S229 doi:10.1088/1464-4266/4/3/380
Ulrik L Andersen1,2, Ben C Buchler1, Hans-A Bachor1 and Ping Koy Lam1
Show affiliationsOptical quantum nondemolition measurements are performed using a beamsplitter with a nonclassical meter input and a electro-optic feedforward loop. The nonclassical meter input is provided by a stable 4.5 dB amplitude squeezed source generated by an optical parametric amplifier. We show that the implementation of a feedforward loop gives a substantial improvement in the signal transfer efficiency. With a 92% reflective beamsplitter we measure a transfer coefficient of Ts+m = 1.81. The quantum state preparation ability of our system is evaluated using two-dimensional correlation plots. This technique allows the direct visualization of the quantum correlations between the outputs of the QND system.
42.50.Dv Quantum state engineering and measurements
42.79.Fm Reflectors, beam splitters, and deflectors
03.65.Ta Foundations of quantum mechanics; measurement theory
42.50.Lc Quantum fluctuations, quantum noise, and quantum jumps
Issue 3 (June 2002)
Received 23 January 2002, in final form 22 March 2002
Published 8 April 2002
Ulrik L Andersen et al 2002 J. Opt. B: Quantum Semiclass. Opt. 4 S229
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