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**Towards quantum telescopes. Can Quantum Optics serve astronomy?**

MUSE Aglaé Kellerer, Durham University

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**Stimulated emission depletion microscopy (STED)**

Atoms are excited Back into ground state through stimulated emission Atoms emit spontaneously λ/D λ/D << λ/D E1 E0 The diffraction limit is routinely overcome in microscopy

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**Origin of the diffraction limit**

Δx Δpx > ħ telescope aperture detector The diffraction limit is rooted in the Heisenberg uncertainty principle

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**Origin of the diffraction limit**

Δx Δpx > ħ telescope aperture detector The diffraction limit is rooted in the Heisenberg uncertainty principle

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**Origin of the diffraction limit**

Δx Δpx > ħ telescope aperture detector The diffraction limit is rooted in the Heisenberg uncertainty principle

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**Distorted wavefront: knowledge of photon position is improved**

Origin of the diffraction limit Δx Δpx > ħ telescope aperture detector B A Distorted wavefront: knowledge of photon position is improved

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**No-cloning theorem Coincidence detector Amplifier medium**

See: Milonni & Hardies, Phys. Lett. A 1982 Wootters & Zurek, Nature 1982 Mandel, Nature 1983

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**No-cloning theorem Coincidence detector Together Amplifier medium**

Can photon cloning be used to beat the diffraction limit of a telescope? See: Milonni & Hardies, Phys. Lett. A 1982 Wootters & Zurek, Nature 1982 Mandel, Nature 1983

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**No-cloning theorem Coincidence detector Together Amplifier medium**

Can photon cloning be used to beat the diffraction limit of a telescope? See: Milonni & Hardies, Phys. Lett. A 1982 Wootters & Zurek, Nature 1982 Mandel, Nature 1983 No! Huge noise contribution from spontaneous emissions

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**Heralded photon cloning**

Kellerer “Beating the diffraction limit in astronomy via quantum cloning” A&A 2014 Kellerer “Quantum telescopes” A&G in press Heralded photon cloning Together Quantum non-demolition measurement Detector read-out conditioned on trigger-signal The contribution from spontaneous emissions is minimized through use of a trigger signal

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**Quantum non-demolition measurements**

Not applicable to astronomy: the photon is trapped inside the cavity

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**Science 342, 1349 (2013); Quantum non-demolition measurements**

In this experiment the photon is not trapped inside the cavity

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**Towards quantum telescopes: Some questions for the discussion**

Other approaches to overcome the diffraction limit behind a telescope? What medium and cavity are required to amplify a single photon? Quantum non demolition measurements on single photons from an astronomical source?

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