Zobrazeno 1 - 10
of 17
pro vyhledávání: '"Brask, Jonatan B."'
We analyze an all-optical setup which enables Bell-inequality violation over long distances by exploiting probabilistic entanglement swapping. The setup involves only two-mode squeezers, displacements, beamsplitters, and on/off detectors. We analyze
Externí odkaz:
http://arxiv.org/abs/2302.01752
We perform a theoretical investigation into how a two-mode squeezed vacuum state, that has undergone photon loss, can be stored and purified using noiseless amplification with a collection of solid-state qubits. The proposed method may be used to pro
Externí odkaz:
http://arxiv.org/abs/2211.16343
Autor:
Mehboudi, Mohammad, Jørgensen, Mathias R., Seah, Stella, Brask, Jonatan B., Kołodyński, Jan, Perarnau-Llobet, Martí
Publikováno v:
Phys. Rev. Lett. 128, 130502 (2022)
We investigate the limits of thermometry using quantum probes at thermal equilibrium within the Bayesian approach. We consider the possibility of engineering interactions between the probes in order to enhance their sensitivity, as well as feedback d
Externí odkaz:
http://arxiv.org/abs/2108.05932
Autor:
Jørgensen, Mathias R., Kołodyński, Jan, Mehboudi, Mohammad, Perarnau-Llobet, Martí, Brask, Jonatan B.
Publikováno v:
Phys. Rev. A 105, 042601 (2022)
In this work, we propose a theory of temperature estimation of quantum systems, which is applicable in the regime of non-negligible prior temperature uncertainty and limited measurement data. In this regime the problem of establishing a well-defined
Externí odkaz:
http://arxiv.org/abs/2108.05901
Autor:
Hovhannisyan, Karen V., Jørgensen, Mathias R., Landi, Gabriel T., Alhambra, Álvaro M., Brask, Jonatan B., Perarnau-Llobet, Martí
Publikováno v:
PRX Quantum 2, 020322 (2021)
Precise thermometry for quantum systems is important to the development of new technology, and understanding the ultimate limits to precision presents a fundamental challenge. It is well known that optimal thermometry requires projective measurements
Externí odkaz:
http://arxiv.org/abs/2011.10513
Autor:
Manzano, Gonzalo, Sánchez, Rafael, Silva, Ralph, Haack, Géraldine, Brask, Jonatan B., Brunner, Nicolas, Potts, Patrick P.
Publikováno v:
Phys. Rev. Research 2, 043302 (2020)
Thermal machines perform useful tasks--such as producing work, cooling, or heating--by exchanging energy, and possibly additional conserved quantities such as particles, with reservoirs. Here we consider thermal machines that perform more than one us
Externí odkaz:
http://arxiv.org/abs/2009.03830
Publikováno v:
Phys. Rev. Research 2, 033394 (2020)
Precise thermometry is of wide importance in science and technology in general and in quantum systems in particular. Here, we investigate fundamental precision limits for thermometry on cold quantum systems, taking into account constraints due to fin
Externí odkaz:
http://arxiv.org/abs/2001.04096
Autor:
Brask, Jonatan B., Rigas, Ioannes, Polzik, Eugene S., Andersen, Ulrik L., Sorensen, Anders S.
Publikováno v:
Phys. Rev. Lett. 105, 160501 (2010)
We propose a hybrid (continuous-discrete variable) quantum repeater protocol for distribution of entanglement over long distances. Starting from entangled states created by means of single-photon detection, we show how entangled coherent state superp
Externí odkaz:
http://arxiv.org/abs/1004.0083
Autor:
Brask, Jonatan B., Jiang, Liang, Gorshkov, Alexey V., Vuletic, Vladan, Sorensen, Anders S., Lukin, Mikhail D.
Publikováno v:
Phys. Rev. A 81, 020303(R) (2010)
Quantum repeaters based on atomic ensemble quantum memories are promising candidates for achieving scalable distribution of entanglement over long distances. Recently, important experimental progress has been made towards their implementation. Howeve
Externí odkaz:
http://arxiv.org/abs/0907.3839
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