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Paper 1
Entanglement of approximate quantum strategies in XOR games
Dimiter Ostrev, Thomas Vidick
- Year
- 2016
- Journal
- arXiv preprint
- DOI
- arXiv:1609.01652
- arXiv
- 1609.01652
We show that for any $\varepsilon>0$ there is an XOR game $G=G(\varepsilon)$ with $Θ(\varepsilon^{-1/5})$ inputs for one player and $Θ(\varepsilon^{-2/5})$ inputs for the other player such that $Ω(\varepsilon^{-1/5})$ ebits are required for any strategy achieving bias that is at least a multiplicative factor $(1-\varepsilon)$ from optimal. This gives an exponential improvement in both the number of inputs or outputs and the noise tolerance of any previously-known self-test for highly entangled states. Up to the exponent $-1/5$ the scaling of our bound with $\varepsilon$ is tight: for any XOR game there is an $\varepsilon$-optimal strategy using $\lceil \varepsilon^{-1} \rceil$ ebits, irrespective of the number of questions in the game.
Open paperPaper 2
Alignment, Orientation, and Coulomb Explosion of Difluoroiodobenzene Studied with the Pixel Imaging Mass Spectrometry (PImMS) Camera
Kasra Amini, Rebecca Boll, Alexandra Lauer, Michael Burt, Jason W L Lee, Lauge Christensen, Felix Brauße, Terence Mullins, Evgeny Savelyev, Utuq Ablikim, Nora Berrah, Cédric Bomme, Stefan Düsterer, Benjamin Erk, Hauke Höppner, Per Johnsson, Thomas Kierspel, Faruk Krecinic, Jochen Küpper, Maria Müller, Erland Müller, Harald Redlin, Arnaud Rouzée, Nora Schirmel, Jan Thøgersen, Simone Techert, Sven Toleikis, Rolf Treusch, Sebastian Trippel, Anatoli Ulmer, Joss Wiese, Claire Vallance, Artem Rudenko, Henrik Stapelfeldt, Mark Brouard, Daniel Rolles
- Year
- 2017
- Journal
- arXiv preprint
- DOI
- arXiv:1706.08376
- arXiv
- 1706.08376
Laser-induced adiabatic alignment and mixed-field orientation of 2,6-difluoroiodobenzene (C6H3F2I) molecules are probed by Coulomb explosion imaging following either near-infrared strong-field ionization or extreme-ultraviolet multi-photon inner-shell ionization using free-electron laser pulses. The resulting photoelectrons and fragment ions are captured by a double-sided velocity map imaging spectrometer and projected onto two position-sensitive detectors. The ion side of the spectrometer is equipped with the Pixel Imaging Mass Spectrometry (PImMS) camera, a time-stamping pixelated detector that can record the hit positions and arrival times of up to four ions per pixel per acquisition cycle. Thus, the time-of-flight trace and ion momentum distributions for all fragments can be recorded simultaneously. We show that we can obtain a high degree of one- and three-dimensional alignment and mixed- field orientation, and compare the Coulomb explosion process induced at both wavelengths.
Open paper