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Deterministic Creation of Macroscopic Cat States.

Lombardo D, Twamley J - Sci Rep (2015)

Bottom Line: Despite current technological advances, observing quantum mechanical effects outside of the nanoscopic realm is extremely challenging.In this work we develop a completely deterministic method of macroscopic quantum state creation.It is found that by using a Bose-Einstein condensate as a membrane high fidelity cat states with spatial separations of up to ∼300 nm can be achieved.

View Article: PubMed Central - PubMed

Affiliation: Centre for Engineered Quantum Systems, Department of Physics and Astronomy, Macquarie University, Sydney, NSW 2109, Australia.

ABSTRACT
Despite current technological advances, observing quantum mechanical effects outside of the nanoscopic realm is extremely challenging. For this reason, the observation of such effects on larger scale systems is currently one of the most attractive goals in quantum science. Many experimental protocols have been proposed for both the creation and observation of quantum states on macroscopic scales, in particular, in the field of optomechanics. The majority of these proposals, however, rely on performing measurements, making them probabilistic. In this work we develop a completely deterministic method of macroscopic quantum state creation. We study the prototypical optomechanical Membrane In The Middle model and show that by controlling the membrane's opacity, and through careful choice of the optical cavity initial state, we can deterministically create and grow the spatial extent of the membrane's position into a large cat state. It is found that by using a Bose-Einstein condensate as a membrane high fidelity cat states with spatial separations of up to ∼300 nm can be achieved.

No MeSH data available.


Related in: MedlinePlus

The fidelity between the evolved state at each time step with a corresponding ideal cat state using several cavity dampening rates, κc, and N = 2.The sharp peaks correspond to evolution in the transparent membrane regime whereas the thicker peaks correspond to an artefact of disentanglement unitary, as the projection is only conditional on position and not momentum. The fidelity is unity initially as .
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f10: The fidelity between the evolved state at each time step with a corresponding ideal cat state using several cavity dampening rates, κc, and N = 2.The sharp peaks correspond to evolution in the transparent membrane regime whereas the thicker peaks correspond to an artefact of disentanglement unitary, as the projection is only conditional on position and not momentum. The fidelity is unity initially as .

Mentions: The coherent amplitude, βM(t), corresponds to the membrane’s state when evolving under identical conditions. The results show (Fig. 10) that with the cat state is destroyed before the first flip is performed. Using literature values, , the state partially survives the first cavity state flip19. For ideal results, F > 80%, the ratio between the mechanical trap frequency of the BEC and the cavity loss rate must be increased by a factor of 20 where the cat state survives all three cavity state flips.


Deterministic Creation of Macroscopic Cat States.

Lombardo D, Twamley J - Sci Rep (2015)

The fidelity between the evolved state at each time step with a corresponding ideal cat state using several cavity dampening rates, κc, and N = 2.The sharp peaks correspond to evolution in the transparent membrane regime whereas the thicker peaks correspond to an artefact of disentanglement unitary, as the projection is only conditional on position and not momentum. The fidelity is unity initially as .
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4561959&req=5

f10: The fidelity between the evolved state at each time step with a corresponding ideal cat state using several cavity dampening rates, κc, and N = 2.The sharp peaks correspond to evolution in the transparent membrane regime whereas the thicker peaks correspond to an artefact of disentanglement unitary, as the projection is only conditional on position and not momentum. The fidelity is unity initially as .
Mentions: The coherent amplitude, βM(t), corresponds to the membrane’s state when evolving under identical conditions. The results show (Fig. 10) that with the cat state is destroyed before the first flip is performed. Using literature values, , the state partially survives the first cavity state flip19. For ideal results, F > 80%, the ratio between the mechanical trap frequency of the BEC and the cavity loss rate must be increased by a factor of 20 where the cat state survives all three cavity state flips.

Bottom Line: Despite current technological advances, observing quantum mechanical effects outside of the nanoscopic realm is extremely challenging.In this work we develop a completely deterministic method of macroscopic quantum state creation.It is found that by using a Bose-Einstein condensate as a membrane high fidelity cat states with spatial separations of up to ∼300 nm can be achieved.

View Article: PubMed Central - PubMed

Affiliation: Centre for Engineered Quantum Systems, Department of Physics and Astronomy, Macquarie University, Sydney, NSW 2109, Australia.

ABSTRACT
Despite current technological advances, observing quantum mechanical effects outside of the nanoscopic realm is extremely challenging. For this reason, the observation of such effects on larger scale systems is currently one of the most attractive goals in quantum science. Many experimental protocols have been proposed for both the creation and observation of quantum states on macroscopic scales, in particular, in the field of optomechanics. The majority of these proposals, however, rely on performing measurements, making them probabilistic. In this work we develop a completely deterministic method of macroscopic quantum state creation. We study the prototypical optomechanical Membrane In The Middle model and show that by controlling the membrane's opacity, and through careful choice of the optical cavity initial state, we can deterministically create and grow the spatial extent of the membrane's position into a large cat state. It is found that by using a Bose-Einstein condensate as a membrane high fidelity cat states with spatial separations of up to ∼300 nm can be achieved.

No MeSH data available.


Related in: MedlinePlus