Soliton Confinement in a Quantum Circuit
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arXiv
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| Format: | Preprint |
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2023
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| _version_ | 1866916095692111872 |
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| author | Roy, Ananda Lukyanov, Sergei L. |
| author_facet | Roy, Ananda Lukyanov, Sergei L. |
| contents | Confinement of topological excitations into particle-like states - typically associated with theories of elementary particles - are known to occur in condensed matter systems, arising as domain-wall confinement in quantum spin chains. However, investigation of confinement in the condensed matter setting has rarely ventured beyond lattice spin systems. Here, we analyze the confinement of sine-Gordon solitons into mesonic bound states in a one-dimensional, quantum electronic circuit~(QEC) array, constructed using experimentally-demonstrated circuit elements: Josephson junctions, capacitors and $0-π$ qubits. The interactions occurring naturally in the QEC array, due to tunneling of Cooper-pairs and pairs of Cooper-pairs, give rise to a non-integrable, interacting, lattice model of quantum rotors. In the scaling limit, the latter is described by the quantum sine-Gordon model, perturbed by a cosine potential with a different periodicity. We compute the string tension of confinement of sine-Gordon solitons and the changes in the low-lying spectrum in the perturbed model. The scaling limit is reached faster for the QEC array compared to conventional spin chain regularizations, allowing high-precision numerical investigation of the strong-coupling regime of this non-integrable quantum field theory. Our results, obtained using the density matrix renormalization group method, could be verified in a quench experiment using state-of-the-art QEC technologies. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2302_06289 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Soliton Confinement in a Quantum Circuit Roy, Ananda Lukyanov, Sergei L. Quantum Physics Mesoscale and Nanoscale Physics Statistical Mechanics High Energy Physics - Theory Confinement of topological excitations into particle-like states - typically associated with theories of elementary particles - are known to occur in condensed matter systems, arising as domain-wall confinement in quantum spin chains. However, investigation of confinement in the condensed matter setting has rarely ventured beyond lattice spin systems. Here, we analyze the confinement of sine-Gordon solitons into mesonic bound states in a one-dimensional, quantum electronic circuit~(QEC) array, constructed using experimentally-demonstrated circuit elements: Josephson junctions, capacitors and $0-π$ qubits. The interactions occurring naturally in the QEC array, due to tunneling of Cooper-pairs and pairs of Cooper-pairs, give rise to a non-integrable, interacting, lattice model of quantum rotors. In the scaling limit, the latter is described by the quantum sine-Gordon model, perturbed by a cosine potential with a different periodicity. We compute the string tension of confinement of sine-Gordon solitons and the changes in the low-lying spectrum in the perturbed model. The scaling limit is reached faster for the QEC array compared to conventional spin chain regularizations, allowing high-precision numerical investigation of the strong-coupling regime of this non-integrable quantum field theory. Our results, obtained using the density matrix renormalization group method, could be verified in a quench experiment using state-of-the-art QEC technologies. |
| title | Soliton Confinement in a Quantum Circuit |
| topic | Quantum Physics Mesoscale and Nanoscale Physics Statistical Mechanics High Energy Physics - Theory |
| url | https://arxiv.org/abs/2302.06289 |