@Takis_Angelides

PhD Student at DESY Zeuthen and Humboldt University of Berlin, interested in classical computing with tensor networks and quantum computing.

 Berlin
Joined July 2009
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Our new paper is on arxiv today demonstrating a phase transition in 1+1 QED with a digital quantum computer! arxiv.org/abs/2312.12831

First-Order Phase Transition of the Schwinger Model with a Quantum Computer

We explore the first-order phase transition in the lattice Schwinger model in the presence of a topological $θ$-term by means of the variational quantum eigensolver (VQE). Using two different...

arxiv.org
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Finding the inverse of a quantum operator expressed as an MPO with @ITensorLib : github.com/TakisAngelides/IT…
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Implemented from scratch the DMRG algorithm with @ITensorLib, which can be a helpful example on the basics of ITensors and to understand the details of DMRG's implementation. Code: github.com/TakisAngelides/IT…
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I have coded for educational puproses an example of the plain tensor renormalization group algorithm for the 2D classical Ising model in Julia based on the nice description of the algorithm found here tensornetwork.org/trg/. Code: github.com/TakisAngelides/TR…
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New paper today arxiv.org/abs/2303.11016 wrapping up the work on the mass shift of Wilson fermions in the Hamiltonian formulation. Matrix product states and @ITensorLib DMRG give impressive simulation performance.

Computing the Mass Shift of Wilson and Staggered Fermions in the...

Simulations of lattice gauge theories with tensor networks and quantum computing have so far mainly focused on staggered fermions. In this paper, we use matrix product states to study Wilson...

arxiv.org
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This is completing the work from the proceeding arxiv.org/abs/2211.12169 stemming from the 2022 Lattice conference in Bonn. New results include the periodicity of the mass shift in θ, continuum extrapolation of Schwinger boson mass and more.
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In case you find this useful, I wrote a quick python function to evaluate quantum circuits symbolically. Input your initial state and the gates to apply (which can be parameterised by symbols) to get the final statevector. github.com/TakisAngelides/Qu…
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Some of the work done in my first PhD project is shown in arxiv.org/abs/2211.12169. The paper is about measuring the mass shift attributed to the use of Wilson fermions as applied to the Schwinger model with a topological theta term in the Hamiltonian formulation using @ITensorLib
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Where it all started.
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