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23 papers · 2 filters
Detecting metrologically useful entanglement in the vicinity of Dicke states
Iagoba Apellaniz, Bernd Lücke, Jan Peise +2
We present a method to verify the metrological usefulness of noisy Dicke states of a particle ensemble with only a few collective measurements, without the need for a direct measur…
Regular phase operator and SU(1,1) coherent states of the harmonic oscillator
Sandor Varro
A new solution is proposed to the long-standing problem of describing the quantum phase of a harmonic oscillator. In terms of an'exponential phase operator', defined by a new 'pola…
Construction of quantum states by special superpositions of coherent states
P. Adam, E. Molnar, G. Mogyorosi +3
We consider the optimal approximation of certain quantum states of a harmonic oscillator with the superposition of a finite number of coherent states in phase space placed either o…
Testing spontaneous wave-function collapse models on classical mechanical oscillators
Lajos Diósi
We show that the heating effect of spontaneous wave-function collapse models implies an experimentally significant increment of equilibrium temperature in a mechanical oscilla…
Evaluation of convex roof entanglement measures
Geza Toth, Tobias Moroder, Otfried Gühne
We show a powerful method to compute entanglement measures based on convex roof constructions. In particular, our method is applicable to measures that, for pure states, can be wri…
Optimization of periodic single-photon sources
Peter Adam, Matyas Mechler, Imre Santa +1
We introduce a theoretical framework which is suitable for the description of all spatial and time-multiplexed periodic single-photon sources realized or proposed thus far. Our mod…