The quantum computational speed of a single Cooper Pair box

TL;DR

This paper investigates how the computational speed of a charged qubit, specifically a Cooper Pair box, is affected by photon number and coupling strength in a cavity, revealing control strategies for optimizing quantum computation speed.

Contribution

It introduces the concept of orthogonality speed in a Cooper Pair box and analyzes how photon number and coupling influence computational speed, offering new control methods.

Findings

Speed increases with photon number in the cavity.

Higher qubit-field coupling decreases computational speed.

Photon number can be used as a control parameter.

Abstract

The speed of computations is investigated by means of the orthogonality speed for a charged qubit interacting with a single cavity field prepared initially in a Fock state or Binomial state. We observe that the rate of the computational speed is related to the number of photons inside the cavity. Moreover, we show that the qubit-field coupling plays an opposite role, where the speed of computations is decreased as the coupling is increased. We suggest using the number of photons in the field as a control parameter to improve the speed of computations.