Generation of Squeezed Vacuum Using Wavelength-Tunable Soliton Pulse and Nonlinear Polarization Interferometer

Purification of Squeezed Vacuum Pulse Generated from a Sagnac Loop Fiber Using Linear Optics and Conditional Homodyne Detection

“…When the laser power incident to a squeezer increases, the squeezing level tends to saturate whereas the anti-squeezing level monotonically increases. Although a better purity of Á 2 X $ À2 dB and Á 2 Y $ 4 dB has been reported, 11) so far in most experiments the purity is significantly degraded when the squeezing level approaches À3 dB, the squeezing level required to generate a quantum entangled state. Therefore, purification schemes that can be achieved without the use of additional optical nonlinear processes and non-classical states are in strong demand.…”

“…5) Samples of squeezed and anti-squeezed quadrature variances reported so far for quadrature squeezed light are summarized in Table I. [6][7][8][9][10][11][12] These purity factors of Á 2 XÁ 2 Y (a product of two quadrature variances) are much worse than the uncertainty limit. When the laser power incident to a squeezer increases, the squeezing level tends to saturate whereas the anti-squeezing level monotonically increases.…”