This ia a good example of how wrong were older notions that all quantum states had to be extremely fragile and very short-lived.
The full preprint of this paper is available at: http://arxiv.org/abs/quant-ph/0703270 Jones Beene wrote Fri, 11 Jan 2013 16:47:13 -- > One way to define active sites for a gainful Ni-H reactor would be as a > "topologically decoherence-protected nanocavities (Casimir cavities or > pits) > filled with protons" > > This is not dissimilar: > > Topologically Decoherence-Protected Qubits with Trapped Ions > > http://prl.aps.org/abstract/PRL/v99/i2/e020503 > > "We show that trapped ions can be used to simulate a highly symmetrical > Hamiltonian with eigenstates naturally protected against local sources of > decoherence. This Hamiltonian involves long-range coupling between > particles > and provides a more efficient protection than nearest neighbor models > discussed in previous works. Our results open the perspective of > experimentally realizing, in controlled atomic systems, complex entangled > states with decoherence times up to 9 orders of magnitude longer than > isolated quantum systems." >
