Figure | Robust Weak Measurement: Setup and Results (IMAGE)

Light Publishing Center, Changchun Institute of Optics, Fine Mechanics And Physics, CAS

Figure | Robust Weak Measurement: Setup and Results

Caption

a, Experimental setup. Photons at 702 nm from a single-mode fiber (SMF) are decoupled and collimated in a free-space Gaussian mode. The Robust Weak Measurement is obtained by means of the n = 7 identical blocks put after the initial polarizing beam splitter (PBS). A 2D spatial resolving detector (an EM-CCD camera working in photon counting regime) determines the final position of the photons. b, Schematic of each of the n = 7 blocks realizing the RWM: a half-wave plate (HWP) is responsible for the preselection, a pair of birefringent crystals (BCs) implements the weak coupling between the polarization (measured observable) and the transverse momentum (measuring device) of the photon, and finally a polarizing plate (Pol) realizes the postselection. c, Measurement of an anomalous weak value with a single click. The yellow solid lines indicate the boundaries of the eigenvalues spectrum of the measured observable (i.e. the polarization of the photon at n = 7 times). Upon suitable pre- and postselection, the theoretically expected value (18.7) is highlighted by a green dashed line, while the white pixel and red uncertainty bars show the single-shot experimental result, 21.4 ± 4.5.

Credit

by Enrico Rebufello, Fabrizio Piacentini, Alessio Avella, Muriel A. de Souza, Marco Gramegna, Jan Dziewior, Eliahu Cohen, Lev Vaidman, Ivo Pietro Degiovanni, and Marco Genovese

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