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  • Staff Member
    Caslav Brukner
  • News
    Gravitational SL(2, ℝ) algebra on the light cone
    05.08.2021
    term alters the boundary symmetries. To infer the Poisson brackets among Dirac observables, we define an auxiliary phase space, where the SL(2 , ℝ) symmetries of the boundary fields are manifest. We identify the gauge generators and second-class constraints that remove the auxiliary variables. All gauge generators are at most quadratic in the fundamental SL(2 , ℝ) variables on phase space. We compute the Dirac bracket and identify the Dirac observables on the light cone. ...
  • News
    Gravitational SL(2, ℝ) algebra on the light cone
    03.08.2021
    term alters the boundary symmetries. To infer the Poisson brackets among Dirac observables, we define an auxiliary phase space, where the SL(2 , ℝ) symmetries of the boundary fields are manifest. We identify the gauge generators and second-class constraints that remove the auxiliary variables. All gauge generators are at most quadratic in the fundamental SL(2 , ℝ) variables on phase space. We compute the Dirac bracket and identify the Dirac observables on the light cone. ...
  • News
    Invitation to a talk: Kavan Modi, Wednesday, May 23 2018, 2 pm at the IQOQI Seminar Room
    23.05.2018
    many-body state using linear (in the number of time steps) amount of bipartite entanglement. The many-body state can be measured to any desired precision, thus the process can be characterised to any desired precision. Wednesday, May 23, 2018 2:00 pm IQOQI Seminar room, 2nd floor Boltzmanngasse 3, 1090 Vienna Hosted by: Časlav Brukner
  • News
    Invitation to a talk: Marcelo Terra Cunha, Wednesday, May 16th 2018, 2 pm at the IQOQI Seminar Room
    16.05.2018
    scenarios? This is a joint work in progress, with Rafael Rabelo and Adán Cabello. In the talk, I will give answers to all those questions, and formulate some other questions to which we only have partial answers. Wednesday, May 16, 2018 2:00 pm IQOQI Seminar room, 2nd floor Boltzmanngasse 3, 1090 Vienna Hosted by: Časlav Brukner
  • News
    Invitation to talks by: Pepijn W.H. Pinkse, Claudio Conti and Giulia Marucci, Tuesday Feb. 20th 2018, 2:00 PM at the IQOQI Seminar Room
    20.02.2018
    Quantum Optics”, adaptive optical methods counteract or even exploit disorder. We have used that to show that with wavefront modulators, multiple-scattering materials can be turned into programmable linear optical net­works. The simplest example of a 2x2 network, i.e., a beam splitter, already yields surprising results. In such a network we demonstrate programmable Hong-Ou-Mandel-type two-photon quantum interference. These multiple-scattering materials can also be used as ...
  • News
    Into the radial modes of light
    09.03.2018
    modes are routed to the two different outputs. For example, even and odd number of rings can be distinguished. The trick here is to achieve a ring-number dependent phase. The physical realization was found with the help of the computer algorithm Melvin [2]. The scientists use a geometric phase that accumulates during propagation through lens systems. This so-called Gouy phase can be chosen with a specific arrangement of lenses such that, for example, for an even number of ...
  • Event
    Martingale theory for entropy production in quantum thermodynamics
    12.02.2020
    two terms, obeying independent fluctuation theorems, and a set of universal relations for their stopping-time (e.g. fist-passage times, scape times, ...) and Infimum statistics during fixed time-intervals [2]. [1] G. Manzano, J. M. Horowitz, and J. M. R. Parrondo, Phys. Rev. X 8 , 031037 (2018). [2] G. Manzano, R. Fazio, and É. Roldán, Phys. Rev. Lett. 122 , 220602 (2019).
  • Event
    Non-local quantum interference controlled by an undetected photon and integrated photonics for quantum network
    29.06.2023
    quantum information processing based on integrated optics architecture and their potential applications in a metropolitan fiber network. They include: 1. Heterogeneously integrated, superconducting silicon-photonic chip for quantum key distribution [2]; 2. Solid-state quantum memory at telecom wavelength [3]. 3. Generation and manipulation of multiphoton entangled states [4]. References: Qian, K. et al. Multiphoton non-local quantum interference controlled by an undetected ...
  • News
    Quantum experiments as an ideal test field for artificial intelligence
    14.02.2018
    developed the algorithm Melvin, which can automatically design new quantum experiments for which the human scientists had no answer until then [1]. Several of these experiments have been successfully implemented in the laboratories of Zeilinger group [2-4]. Also, the unintuitive solutions of the algorithm have led to new ideas and connections in quantum physics [5,6]. Now the Viennese physicists have joined forces with the group of Hans Briegel from the University of ...