Ion Trap And Transport On The Chip

With the development of the large-scale integration circuit, the classical computer is going to reach the limitation made by classical physics. It is difficult to increase the computer power of the classical computers. Quantum computation has received huge interests around the world because of its potential of exponentially speeding up the computing, shedding light on the possibility of solving some complex computing tasks which are hard for classical computers. A few qubits manipulation have been achieved in experiment, the following challenge is the scaling problem. The quantum charge-coupled device could perform the entanglement between ions in different traps. It is promising to achieve scaling quantum computation, and so has been studied widely.This paper aims at the qubits scaling. Firstly, we simulated the planar trap by software, and got the trap depth and the ion height. Secondly, we optimized the junction, decreased the variance of ion height during the ion transport, and depressed the barrier of pseudopotential along the transport trajectory. So the height and amplitude of the pseudopotential minimum are almost the same as in a single trap, the ion could be transported stably and adiabatically. Finally, we theoretically suggested an adiabatic transport scheme, which is different from the common non-adiabatic transport. The vibration state of ion keeps constant during the shuttle of the ions in this scheme. The scheme is robust against the voltage fluctuation and increases little phonon. Besides, it may not harm the internal state of the ion even in the situation where there exists entanglement between the internal and external states. Finally, the adiabatic transport omits the recooling stages which may be necessary in non-adiabatic transport, so the time cost of the adiabatic transport is of the order a few milliseconds, which is the same as the non-adiabatic transport.