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Effective models for quantum optics with multilayer open cavities

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Dec 12, 2024

Bursts of polarised single photons from atom-cavity sources
Bursts of polarised single photons from atom-cavity sources

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Sep 25, 2023

How to administer an antidote to Schrödinger's cat
How to administer an antidote to Schrödinger's cat

In his 1935 Gedankenexperiment, Erwin Schrödinger imagined a poisonous substance which has a 50% probability of being released, based on the decay of a radioactive atom. As such, the life of the cat and the state of the poison become entangled, and the fate of the cat is determined upon opening the box. We present an experimental technique that keeps the cat alive on any account. This method relies on the time-resolved Hong-Ou-Mandel effect: two long, identical photons impinging on a beam splitter always bunch in either of the outputs. Interpreting the first photon detection as the state of the poison, the second photon is identified as the state of the cat. Even after the collapse of the first photon’s state, we show their fates are intertwined through quantum interference. We demonstrate this by a sudden phase change between the inputs, administered conditionally on the outcome of the first detection, which steers the second photon to a pre-defined output and ensures that the cat is always observed alive.

Mar 17, 2022

Light-matter interaction in open cavities with dielectric stacks
Light-matter interaction in open cavities with dielectric stacks

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Apr 12, 2021

Random number generation by coherent detection of quantum phase noise
Random number generation by coherent detection of quantum phase noise

‘In 2010 Qi et al. [Opt. Lett. 35(3), 312 (2010)] demonstrated a random number generator based on the drift of the phase of a laser due to spontaneous emission, The out-of-the-lab implementation of this scheme presents two main drawbacks: it requires a long and highly unbalanced interferometer to generate a random phase with uniform probability distribution, or alternatively, a shorter and slightly unbalanced interferometer that notwithstanding requires active stabilization and does not generate a uniform probability distribution without randomness extraction. Here we demonstrate that making use of the random nature of the phase difference between two independent laser sources and two coherent detectors we can overcome these limitations. The two main advantages of the system demonstrated are: i) it generates a probability distribution of quantum origin which is intrinsically uniform and thus in principle needs no randomness extraction for obtaining a uniform distribution, and ii) the phase is measured with telecom equipment routinely used for high capacity coherent optical communications. The speed of random bit generation is determined by the photodetector bandwidth and the linewidth of the lasers. As a by-product of our method, we have obtained images of how phase noise develops with time in a laser. This provides a highly visual alternative way of measuring the coherence time of a laser.’

Jan 12, 2020

Interference of two pulse-like spatial beams with arbitrary transverse separation
Interference of two pulse-like spatial beams with arbitrary transverse separation

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Apr 30, 2018

Implementation and characterization of a controllable dephasing channel based on coupling polarization and spatial degrees of freedom of light
Implementation and characterization of a controllable dephasing channel based on coupling polarization and spatial degrees of freedom of light

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Apr 30, 2018