Physics – Quantum Physics
Scientific paper
2010-07-08
Phys. Rev. A 82, 052108 (2010)
Physics
Quantum Physics
5 pages, 5 figures, Published version
Scientific paper
10.1103/PhysRevA.82.052108
We investigate the discrete-time quantum walk evolution under the influence of the periodic measurements in position subspace. The undisturbed survival probability of the particle at the position subspace, $P(0, t)$ is compared with the survival probability after frequent ($n$) measurements at interval $\tau = t/n$, $P(0, \tau)^n$. We show that $P(0, \tau)^n > P(0, t)$ leading to the quantum Zeno effect in the position subspace when a parameter $\theta$ in the quantum coin operations and frequency of measurements is greater than the critical value, $\theta > \theta_{c}$ and $n>n_{c}$. This Zeno effect in the subspace preserves the dynamics in coin Hilbert space of the walk dynamics and has a potential to play a significant role in quantum tasks such as, preserving the quantum state of the particle at any particular position and to understand the Zeno dynamics in a multidimensional system which is highly transient in nature.
No associations
LandOfFree
Zeno subspace in quantum-walk dynamics does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Zeno subspace in quantum-walk dynamics, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Zeno subspace in quantum-walk dynamics will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-102507