Time-Continuous Bell Measurements
- Author(s)
- Sebastian Hofer, Denis V. Vasilyev, Markus Aspelmeyer, Klemens Hammerer
- Abstract
We combine the concept of Bell measurements, in which two systems are projected into a maximally entangled state, with the concept of continuous measurements, which concerns the evolution of a continuously monitored quantum system. For such time-continuous Bell measurements we derive the corresponding stochastic Schrödinger equations, as well as the unconditional feedback master equations. Our results apply to a wide range of physical systems, and are easily adapted to describe an arbitrary number of systems and measurements. Time-continuous Bell measurements therefore provide a versatile tool for the control of complex quantum systems and networks. As examples we show that (i) two two-level systems can be deterministically entangled via homodyne detection, tolerating photon loss up to 50%, and (ii) a quantum state of light can be continuously teleported to a mechanical oscillator, which works under the same conditions as are required for optomechanical ground-state cooling.
- Organisation(s)
- Quantum Optics, Quantum Nanophysics and Quantum Information
- External organisation(s)
- Gottfried Wilhelm Leibniz Universität Hannover, Max-Planck-Institut für Gravitationsphysik (Albert Einstein Institut)
- Journal
- Physical Review Letters
- Volume
- 111
- No. of pages
- 6
- ISSN
- 0031-9007
- DOI
- https://doi.org/10.1103/PhysRevLett.111.170404
- Publication date
- 10-2013
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103036 Theoretical physics, 103025 Quantum mechanics
- Keywords
- Portal url
- https://ucris.univie.ac.at/portal/en/publications/timecontinuous-bell-measurements(e7f47f43-13ca-46af-adb4-5b0f4635c2c6).html