Controllability of quantum objects

Sonia G. Schirmer, I. C. H. Pullen, A. I. Solomon

Ya-Fei Yu, Tang-Kun Liu, Yanxia Huang +1 more

We consider the two-object remote quantum control for a special case in which all the object qubits are in a telecloning state. We propose a scheme which achieves the two-object remote quantum control by using two particular four-particle entangled states.

N T Valishin

Abstract On the basis of the V-function method, the physical statement of controllability as a wave motion of an object to a new state is carried out. It follows from the V-function method that the wave motion of an object is inextricably linked with its trajectory. It is shown that controllability as an object leaves the state occurs in the direction of the gradient of the wave function.

Robert L. Grossman

Paul Kairys, Travis S. Humble

Optimal control theory provides a framework for numerical discovery of device controls that implement quantum logic gates, but common objective functions used for optimization often assign arbitrarily high costs to otherwise useful controls. We propose a framework for designing objective functions that permit novel gate designs such as echo pulses or locally-equivalent gates. We use numerical simulations to demonstrate the efficacy of the new objective functions by designing microwave-only pulses that act as entangling gates for superconducting transmon architectures. We observe that the proposed objective functions lead to higher fidelity controls in fewer optimization iterations than obtainable by traditional objective functions.

Gabriel Turinici, HERSCHEL A. RABITZ