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Preserving Quantum States : A Super-Zeno Effect | | Deepak Dhar
; Lov K. Grover
; Shasanka M. Roy
; | | Date: |
9 Apr 2005 | | Subject: | quant-ph | | Abstract: | We consider a quantum mechanical state initially in a subspace ${mathcal{P}}$ of the full Hilbert space of the system and subjected to a sequence of appropriately spaced short-duration pulses. In between the pulses, the evolution of the system is governed by its Hamiltonian. The pulse adds a phase $pi$ to the vectors in the subspace ${mathcal{P}}$. We construct a sequence of $N$ pulses within a finite time interval $T$ such that the probability of finding the system outside ${mathcal{P}}$ at $T$ can be made as small as $2^{- (log_2 N)^{2}}$, for large $N$. | | Source: | arXiv, quant-ph/0504070 | | Services: | Forum | Review | PDF | Favorites | |
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