Abstract
We present the implementation of a compact setup for the generation of sub-Poissonian states of light exhibiting the analogous of antibunching behavior in the so-called mesoscopic intensity domain. In the scheme, the idler arm of a pulsed multi-mode twin-beam state is directly measured by a photon-number-resolving detector, whereas the signal arm is divided at a balanced beam splitter, at whose outputs other two photon-number-resolving detectors measure the number of photons. The three detectors measure synchronous with each laser pulse. Due to the nonclassical correlations in the twin beam, when a given value of photons is measured in the idler arm, the conditional states obtained in post processing at the two beam-splitter outputs are nonclassical, showing lower-than-one values of the Fano factor and of the photon autocorrelation coefficient. The possibility to engineer sub-Poissonian states nearly approaching the Fock state with one photon is also addressed.
Highlights
We present the implementation of a compact setup for the generation of sub-Poissonian states of light exhibiting the analogous of antibunching behavior in the so-called mesoscopic intensity domain
The standard technique is based on a Hanbury Brown-Twiss interferometer5, in which the emitted light is divided at a 50/50 beam-splitter (BS) and two single-photon detectors are placed at the two outputs
When a given value of photons is measured in the idler arm, the conditional states obtained in post processing at the two BS outputs exhibit sub-Poissonian statistics and negativity of the quantity gn[2] − 1, but they are shot-by-shot anti-correlated in the number of photons
Summary
We present the implementation of a compact setup for the generation of sub-Poissonian states of light exhibiting the analogous of antibunching behavior in the so-called mesoscopic intensity domain. The standard technique is based on a Hanbury Brown-Twiss interferometer, in which the emitted light is divided at a 50/50 beam-splitter (BS) and two single-photon detectors are placed at the two outputs. This scheme is used to evaluate the second-order autocorrelation function gn[2], which is not accessible by direct measurement in the case of a single-photon state. When a given value of photons is measured in the idler arm, the conditional states obtained in post processing at the two BS outputs exhibit sub-Poissonian statistics and negativity of the quantity gn[2] − 1, but they are shot-by-shot anti-correlated in the number of photons. We show that a double conditioning procedure can be used to achieve pairs of high-fidelity single-photon Fock states
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