Preparation of entangled states through Hilbert space engineering

Understand

Entangled states are a crucial resource for quantum-based technologies such as quantum computers and quantum communication systems (1,2).

• Exploring new methods for entanglement generation is important for diversifying and eventually improving current approaches.
• Here, we create entanglement in atomic ions by applying laser fields to constrain the evolution to a restricted number of states, in an approach that has become known as "quantum Zeno dynamics" (3-5).
• With two trapped $^9\rm{Be}^+$ ions, we obtain Bell state fidelities up to $0.990^{+2}_{-5}$, with three ions, a W-state (6) fidelity of $0.910^{+4}_{-7}$ is obtained.