High-fidelity multipartite entanglement creation in non-Hermitian qubits
arXiv:2412.01133 · doi:10.1088/1361-6455/adc2bd
Abstract
Non-Hermitian quantum systems showcase many distinct and intriguing features with no Hermitian counterparts. One of them is the exceptional point which marks the PT (parity and time) symmetry phase transition, where an enhanced spectral sensitivity arises and leads to novel quantum engineering. Here we theoretically study the multipartite entanglement properties in non-Hermitian superconducting qubits, where high-fidelity entangled states can be created under strong driving fields or strong couplings among the qubits. Under an interplay between driving fields, couplings, and non-Hermiticity, we focus on generations of GHZ states or GHZ classes in three and four qubits with all-to-all couplings, which allows a fidelity approaching unity when relatively low non-Hermitian decay rates are considered. This presents an ultimate capability of non-Hermitian qubits to host a genuine and maximal multipartite entanglement. Our results can shed light on novel quantum engineering of multipartite entanglement generations in non-Hermitian qubit systems.
4 figures
References in corpus (14)
- Making Sense of Non-Hermitian Hamiltonians
- Topological Origin of Non-Hermitian Skin Effects
- Quantum trajectories and open many-body quantum systems
- Universal non-Hermitian skin effect in two and higher dimensions
- Topological quantum state control through exceptional-point proximity
- Speeding up entanglement generation by proximity to higher-order exceptional points
- Fast multi-qubit gates through simultaneous two-qubit gates
- Rényi entropies and negative central charges in non-Hermitian quantum systems
- General properties of fidelity in non-Hermitian quantum systems with PT symmetry
- A non-Hermitian optical atomic mirror
- Symmetry-resolved entanglement in critical non-Hermitian systems
- Modular quantum processor with an all-to-all reconfigurable router
- Entanglement Hamiltonian and effective temperature of non-Hermitian quantum spin ladders
- Accelerating multipartite entanglement generation in non-Hermitian superconducting qubits