Muhammad Waseem

Dynamics and multiqubit entanglement in distant resonators

  1. Muhammad Waseem,
  2. Muhammad Nehal Khan,
  3. and Shahid Qamar
We consider the dynamics of the photon states in distant resonators coupled to a common bus resonator at different positions. The frequencies of distant resonators from a common bus
resonator are equally detuned. These frequency detunings are kept larger than the coupling strengths of each resonator to the common bus resonator to satisfy the dispersive interaction regime. In the dispersive regime, we show that the time dynamics of the system evolve to an arbitrary W-type state in a single step at various interaction times. Our results show that a one-step generation of arbitrary W-type states can be achieved with high fidelity in a system of superconducting resonators.
arxiv pdf

Three qubit Grover’s algorithm using superconducting quantum interference devices in cavity QED

  1. Muhammad Waseem,
  2. Rizwan Ahmed,
  3. Muhammad Irfan,
  4. and Shahid Qamar
We present a scheme for the implementation of three qubit Grover’s algorithm using four-level superconducting quantum interference devices (SQUIDs) coupled to a superconducting
resonator. The scheme is based on resonant, off-resonant interaction of the cavity field with SQUIDs and the application of classical microwave pulses. We show that adjustment of SQUID level spacing during the gate operations, adiabatic passage, and second-order detuning are not required that leads to faster implementation. We also show that the marked state can be searched with high fidelity even in the presence of level decay and cavity dissipation.
arxiv pdf