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  • Seite
    Fiber-based Quantum Communication
    experiment, in which we used color and timing correlations of a broad-band photon pair source, made it to the cover of Nature magazine in December 2018 [1]. In a collaboration with the University of Bristol, we have extended this experiment to 8 users [2]. Entanglement between Sicily and Malta This large-scale demonstration of entanglement distribution via glass fibers was conducted in a real-world scenario. Using efficient nanowire detectors, we showed that telecom fibers ...
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    Sources of Entanglement
    optimized for the near-infrared, making it especially useful for free-space applications [1]. Another important step towards standardization of source quality was the deployment of two separate crossed-crystal sources producing indistinguishable photons [2]. We also constructed an extremely rigid stand-alone source capable of surviving accelerations up to 30g [3]. Just recently, we demonstrated a completely new way of entanglement creation by utilizing the “HOM-interference” ...
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    Translating quantum systems in time
    then universal time translation is impossible. Hence, in [1, 2] we assume that the Hilbert space dimension of the target is known. To recap, a universal time translation process is a sequence of physical operations together with a measurement that, applied to any target quantum system of a given dimension, will time-translate the system in a non-trivial way, independently of how the target system reacts to each individual operation. In [1, 2] we find that the only possible ...
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    Quantum Metrology
    overhead in N. We then introduce a compression procedure that can be implemented on a 2D cluster with O(N log2N) qubits, which enables one to efficiently perform measurements even when the circuit descriptions of the corresponding unitaries are of exponential size in the number of qubits of the compressed space. These constructions allow achieving Heisenberg scaling for phase and frequency estimation scenarios using the 2D cluster in a flexible manner. Crucially, this ...
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    Quantum Thermodynamics
    Müller, Correlating thermal machines and the second law at the nanoscale , Physical Review X 8 , 041051 (2018). arXiv:1707.03451 . Best Paper Award 2019 by the Austrian Academy of Sciences. [2] J. Scharlau and M. P. Müller, Quantum Horn's lemma, finite heat baths, and the third law of thermodynamics , Quantum 2 , 54 (2018). arXiv:1605.06092 [3] M. P. Müller and M. Pastena, A generalization of majorization that characterizes Shannon entropy , IEEE Trans. Inf. Th. 62 (4), ...
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    Quantum Communication Complexity
    there are three paths (red 1, yellow 2 and blue 3) and for each path there are two directions (+ and -) (right, view from the North pole). Which path and direction should the partners take to find each other at the equatorial line in the lack of any communication? (For an entanglement-assistant solution see Ref. [3]) [1] Č. Brukner, M. Zukowski, J.-W. Pan and A. Zeilinger, Bell's inequality and Quantum Communication Complexity, Phys. Rev. Lett. 92 , 127901 (2004). [2] Č. ...
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    Quantum Sensing
    used to enhance this scheme. The Ursin group has managed to show this quantum sensing effect in the lab – by rotating a source of entanglement in a modified concrete mixer [2]. [1] Y. Chen, M. Fink, F. Steinlechner, J. P. Torres, and R. Ursin, “Hong-Ou-Mandel interferometry on a biphoton beat note,” npj Quantum Inf. , Feb. 2019. [2] M. Fink, F. Steinlechner, J. Handsteiner, J. P. Dowling, T. Scheidl, and R. Ursin, “Entanglement-enhanced optical gyroscope,” New J. Phys. , ...
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    Information Processing
    do process matrices lead to efficient computation of NP-hard problems? In case this latter question is answered positively, process matrices would contradict an assumption in computer science: NP-hard problems are intractable in the physical world [2]. Towards answering this question, some of us managed to upper bound the computational power of causality violations à la process matrices in the classical setting (as opposed to the quantum setting) to UP ⋂ coUP [3]; a class ...
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    Gravitational Quantum Physics
    of the Einstein equivalence principle. Nature Phys 14, 1027–1031 (2018) Bibliography [1] M. Zych, F. Costa, I. Pikovski, Č. Brukner, Quantum interferometric visibility as a witness of general relativistic proper time, Nat. Commun. 2 :505 doi: 10.1038/ncomms1498 (2011) . [2] M. Zych, F. Costa, I. Pikovski, T. C. Ralph and Č. Brukner, General relativistic effects in quantum interference of photons, Class. Quantum Grav. 29 , 224010 (2012) (Cover Page and Highlight of CQG for ...
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    Bell’s Inequalities
    pure entangled states, which satisfy all Bell’s inequalities with two measurement settings per observer [2]. No efficient method for the derivation of Bell’s inequalities with more than two measurement settings per observer is known. A general way is to define the facets of the correlation polytope. Yet, this is computationally hard NP-problem. In 2004 we derived tight Bell’s inequalities for N>2 observers involving more than two alternative measurement settings [3]. Most ...