Project description
Micromechanical oscillators could enable a direct test of quantum gravity
The fundamental forces of the universe all follow the laws of quantum mechanics except gravity. Gravity is an extraordinarily weak force, making it difficult to find a quantum description of it on short scales that is reconciled with our classical one. Recently, certain quantum phenomena have been found to hold true for macroscopic systems. The EU-funded GUANTUM project is building on its team’s previous discoveries on mechanical quantum entanglement for macroscopic-scale objects. The team will use two massive micromechanical oscillators to measure the gravitational force between gold particles weighing a milligram in a novel paradigm in a direct test of quantum gravity.
Objective
Quantum mechanics is a leading success story in science, originally devised to explain matter and energy at the atomic scale. Quantum superpositions and entanglement can produce distinct phenomena unseen in classical physics. Rather recently, such effects have been shown to hold also for macroscopic degrees of freedom, including the motion of somewhat massive objects. However, despite its success at describing phenomena in the low-energy limit, quantum mechanics is incompatible with general relativity that describes gravity and huge energies. The interface between these two has remained experimentally elusive, because only the most violent events in the universe have been considered to produce measurable effects due to the plausible quantum behavior of gravity. Here, we will probe the interface of quantum mechanics and gravity at an unprecedented scale by taking advantage of coupling of microwave fields in cavities and the oscillations of massive micromechanical membranes. We will measure the gravitational force between gold particles weighing a milligram, representing a new mass scale showing gravitational forces within a system. The main goal is to determine the effect of gravity on the quantum evolution of a massive object. We will develop strong quantum measurements in order to reach a situation where the positions of the gravitating masses exhibit significant quantum fluctuations, which includes preparing the gravitating masses in the ground state and in a squeezed state. Our recent work showing mechanical quantum entanglement [Nature 556, 478 (2018)] enables a fascinating goal. With the two oscillators in a two-mode squeezed state, we will create a system that exhibits nonlocal quantum correlations and gravity at the same time, paving the way for directly testing quantum gravity. The project also contributes to technological advances in precision measurements and in quantum information.
Keywords
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Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Programme(s)
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
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H2020-EU.1.1. - EXCELLENT SCIENCE - European Research Council (ERC)
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Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
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Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
ERC-ADG - Advanced Grant
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Call for proposal
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02150 Espoo
Finland
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