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Wavefunctions for strongly correlated systems

Objective

Strongly correlated quantum systems, which are at the heart of many open problems in condensed matter,
quantum chemistry, or high-energy physics, are challenging to understand due to their intricate entanglement
structure. Quantum information theory provides the right framework to characterize highly entangled
states and has given rise to the class of Tensor Network States, which capture the entanglement structure of
strongly correlated systems by building the global wavefunction from local tensors and provide an efficient
description of their low-energy states.

In this project, we will develop a framework for the systematic study of strongly correlated systems using
exact wavefunctions based on Tensor Network States. It will give us the tools to construct controlled families
of states by encoding the relevant structure of the system directly into the wavefunction, rather than a
Hamiltonian, and to study their behavior. Since the tensor describing the wavefunction also gives rise to an
associated Hamiltonian, this establishes a framework for building solvable models with the tensor as the
new central object.

The novelty of our approach lies in the fact that quantum information gives us the tools to systematically
construct wavefunctions for general strongly correlated systems, while at the same time, encoding the
structure of the problem directly into the wavefunction results in small families of states with a direct
physical interpretation of the parameters, unlike for fully variational approaches.

We will apply our framework to study the physics of a range of strongly correlated models, in particular
frustrated fermionic and spin systems, in order to understand the possible physics they can exhibit. This
will enhance our understanding of the physics of strongly correlated systems, and, together with numerical
results, experimental findings, and quantum simulations, ultimately lead to new applications and materials
based on strongly correlated matter.

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Programme(s)

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Topic(s)

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Funding Scheme

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-STG - Starting Grant

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Call for proposal

Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.

(opens in new window) ERC-2014-STG

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Host institution

MAX-PLANCK-GESELLSCHAFT ZUR FORDERUNG DER WISSENSCHAFTEN EV
Net EU contribution

Net EU financial contribution. The sum of money that the participant receives, deducted by the EU contribution to its linked third party. It considers the distribution of the EU financial contribution between direct beneficiaries of the project and other types of participants, like third-party participants.

€ 1 338 500,00
Address
HOFGARTENSTRASSE 8
80539 Munchen
Germany

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Region
Bayern Oberbayern München, Kreisfreie Stadt
Activity type
Research Organisations
Links
Total cost

The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.

€ 1 338 500,00

Beneficiaries (2)

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