Balanced homodyne detection of optical quantum states at audio-band frequencies and below
M. Stefszky, C.M. Mow-Lowry, S.S.Y. Chua, D.A. Shaddock, B.C. Buchler, H. Vahlbruch, A. Khalaidovski, R. Schnabel, P.K. Lam, D.E. McClelland, Classical and Quantum Gravity (2012).