ELFT HÍRADÓ

[Szeminárium koordinátor <szfi-seminar AT wigner.hun-ren.hu>]

SZFI Seminar
Eyal Buks
(Andrew and Erna Viterbi Department of Electrical Engineering, Technion, 
Haifa 32000 Israel, host: Domokos Péter)
Experimentally testing the spontaneous disentanglement hypothesis using a 
magnetic resonator
The spontaneous disentanglement hypothesis is motivated by two outstanding 
issues in the foundations of quantum mechanics (QM). The first one originates 
from the collapse postulate. This postulate arguably gives rise to an 
internal inconsistency in QM [1], which was first introduced in 1935 by 
Schrödinger [2], and which is commonly known as the problem of quantum 
measurement. Moreover, the spontaneous disentanglement hypothesis is relevant 
to an apparent conflict between linearity of standard QM dynamics, and 
experimental observations of multi–stabilities and phase transitions in 
quantum systems.Here, the hypothesis that disentanglement spontaneously 
occurs in quantum systems is experimentally tested using a ferrimagnetic 
resonator. According to this hypothesis, time evolution is governed by a 
modified master equation having an added nonlinear term, which 
deterministically generates disentanglement. The added term can give rise to 
multistabilities, which are otherwise theoretically excluded. Bistability is 
experimentally observed in the resonator’s response to an externally applied 
monochromatic driving [3]. Experimental results are compared with predictions 
derived from the disentanglement–based model, and an alternative model, which 
is based on the method of Bosoniza- tion and the Holstein–Primakoff 
transformation. It is found that better agreement with data is obtained from 
the disentanglement–based model. This finding, together with a difficulty to 
justify the Bosonization–based model, indi- rectly support the spontaneous 
disentanglement hypothesis.[1] Roger Penrose, “Uncertainty in quantum 
mechanics: faith or fantasy?”, Philosophical Transactions of the Royal 
Society A: Mathematical, Physical and Engineering Sciences, vol. 369, no. 
1956, pp. 4864–4890, 2011. [2] E. Schrodinger, “Die gegenwartige situation in 
der quantenmechanik”, Naturwissenschaften, vol. 23, pp. 807, 1935. [3] Eyal 
Buks, “Disentanglement–induced bistability in a magnetic resonator”, Advanced 
Quantum Technologies, p. 2400587, 2025.Friday, 11 April 2025, 10:00
Wigner FK SZFI, Bldg. 1, 2nd floor auditorium
Language of the talk: English
All interested are welcome!
Attila Nagyszfi-seminar AT wigner.hun-ren.hu