Arbitrary-speed quantum gates within large ion crystals through minimum control of laser beams

摘要: We propose a scheme to implement arbitrary-speed quantum entangling gates on two trapped ions immersed in large linear crystal of ions, with minimal control laser beams. For gate speeds slower than the oscillation frequencies trap, single appropriately detuned pulse is sufficient for high-fidelity gates. comparable or faster local ion frequency, we discover five-pulse protocol that exploits only phonon modes. This points method efficiently scaling trap computer without shuttling ions.