Trapped ion scaling with pulsed fast gates

Abstract

Fast entangling gates for trapped ions offer vastly improved gate operation times relative to implemented gates, as well as approaches to trap scaling. Gates on neighbouring ions only involve local ions when performed sufficiently fast, and we find that even a fast gate between distant ions with few degrees of freedom restores all the motional modes given more stringent gate speed conditions. We compare pulsed fast gate schemes, defined by a timescale faster than the trap period, and find that our proposed scheme has less stringent requirements on laser repetition rate for achieving arbitrary gate time targets and infidelities well below $10^{-4}$. By extending gate schemes to ion crystals, we explore the effect of ion number on gate fidelity for coupling neighbouring pairs of ions in large crystals. Inter-ion distance determines the gate time, and a factor of five increase in repetition rate, or correspondingly the laser power, reduces the infidelity by almost two orders of magnitude. We also apply our fast gate scheme to entangle the first and last ions in a crystal. As the number of ions in the crystal increases, significant increases in the laser power are required to provide the short gate times corresponding to fidelity above 0.99.

29 pages, 10 figures

References in corpus (18)

• Scalable multi-particle entanglement of trapped ions
• Quantum computing with trapped ions
• 14-qubit entanglement: creation and coherence
• Observation of entanglement propagation in a quantum many-body system
• Towards fault-tolerant quantum computing with trapped ions
• Fast and robust two-qubit gates for scalable ion trap quantum computing
• Complete methods set for scalable ion trap quantum information processing
• Trapped-ion quantum logic gates based on oscillating magnetic fields
• Trapped ion quantum computation with transverse phonon modes
• Optimal quantum control of multi-mode couplings between trapped ion qubits for scalable entanglement
• T-junction ion trap array for two-dimensional ion shuttling, storage and manipulation
• Ultrafast Gates for Single Atomic Qubits
• Large Scale Quantum Computation in an Anharmonic Linear Ion Trap
• Deterministic entanglement of ions in thermal states of motion
• Coherent control of trapped ions using off-resonant lasers
• Dissipation-Assisted Quantum Information Processing with Trapped Ions
• Pulsed force sequences for fast phase-insensitive quantum gates in trapped ions
• Geometric quantum gate for trapped ions based on optical dipole forces induced by Gaussian laser beams

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