Figure 1 | Scientific Reports

Figure 1

From: Weak value amplification: a view from quantum estimation theory that highlights what it is and what isn’t

Figure 1

Weak value amplification scheme aimed at detecting extremely small temporal delays.

The input pulse polarisation state is selected to be left-circular by using a polariser, a quarter-wave plate (QWP) and a half-wave plate (HWP). A first polarising beam splitter (PBS1) splits the input into two orthogonal linear polarisations that propagate along different arms of the interferometer. An additional QWP is introduced in each arm so that after traversing the QWP twice, before and after reflection in the mirrors, the beam polarisation is rotated by 90° to allow the recombination of both beams, delayed by a temporal delay τ, in a single beam by the same PBS. After PBS1, the output polarisation state is selected with a liquid crystal variable retarder (LCVR) followed by a second polarising beam splitter (PBS2). The variable retarder is used to set the parameter θ experimentally. Finally, the spectrum of each output beam is measured using an optical spectrum analyzer (OSA). (, ) and (, ) correspond to two sets of orthogonal polarisations.

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