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Abstract: We show how a chain of quantum wells with controlled barriers can be used to construct entangled qubits. Controlled Rabi oscillations are used to create entangled states using gates between quantum dots to control the barrier height between neighboring gates. CNOT and variable controlled phase rotation gates are created with the quantum dot chain structures containing neighboring cells with variable distances.
We use WKB approximations to solve the time dependent Schrödinger equation. Using superposition of the resulting Eigenfunction localized quantum dot states can be formed. This is achieved by using unitary operators. The new localized Eigenstates form the basis system for the quantum computation. We describe how this system is used to generate the quantum gate functions and how local potential control can be used to compensate process variations.
This system is implemented as a single chip solution on a fully depleted SOI technology. We show the system architecture of the voltage control for all potential with less than 0.2*qKT resolution, and we show that this can be implemented on-chip with less than 50 mW total power consumption for a 6 GHz pulse generator capability in a 64 qubit system.
Presenter: Dirk Leipold is the CEO of equal1.labs, a self-founded startup company. He envisions the development of a silicon based high speed quantum core using foundry technologies. Dirk Leipold has received his master thesis in quantum optics and his PhD degree in optoelectronics from the University of Konstanz, Germany. He has worked for 25 years in the field of device physics and RF circuit designs, and he has authored and co-authored over 50 papers and created over 150 patents. His product designs have been used in over 1 Billion cell phones, and he has significantly contributed to the development of Bluetooth, WiFi, LTE, and 5G standards.