Supercharging Quantum Entanglement with Multilevel Atomic Arrays
Idea Proposed
Unlike two-level atomic systems, multilevel atoms in weakly-driven arrays can store entanglement in their ground states, which remains intact even after turning off the driving field. This makes them highly valuable for quantum information applications and quantum networking.
How It Works
- Driving and Dipole Interactions: A weak laser drive is applied to an array of multilevel atoms, which interact via dipole-dipole forces mediated by photons. These interactions create strong quantum correlations between atoms.
- Entanglement Generation: At short interatomic distances, quantum entanglement emerges due to the dominance of coherent interactions over spontaneous emission. The entanglement grows as collective spin waves in the ground state.
- Effective Hamiltonian and Dynamics: By adiabatically eliminating the excited states, the system can be described by an effective spin-spin Hamiltonian resembling an anisotropic XY model, where atoms interact via photon-mediated couplings.
- Experimental Feasibility: The study suggests using 88Sr (Strontium-88) atoms with a 2.9 µm transition as an experimental platform. These atoms can be trapped in optical lattices or tweezers, where their quantum states can be manipulated and measured.
How It Can Change Quantum Computing
- Improved Quantum Memories: The entanglement is stored in the ground-state manifold, meaning that once created, it can be preserved without continuous driving, making it useful for long-lived quantum memories.
- Better Quantum Simulations: The strong entanglement and many-body effects observed here can be used to simulate complex quantum phenomena that are difficult to replicate using classical computers.
- More Robust Quantum Information Processing: The ability to engineer specific quantum states in multilevel atoms opens new pathways for creating scalable quantum networks with higher coherence times and less susceptibility to decoherence than conventional two-level quantum bits.
- Enhancing Atomic Clocks: The control over atomic interactions at subwavelength scales can lead to better synchronization in atomic clocks, improving precision in fundamental physics experiments.
Implementation
The implementation can be found here, Entanglement generation in weakly-driven arrays of multilevel atoms via dipolar interactions: https://doi.org/10.48550/arXiv.2405.16101
Sources & citation
Entanglement generation in weakly-driven arrays of multilevel atoms via dipolar interactions: https://doi.org/10.48550/arXiv.2405.16101