where t is the coherence time and A is the Planck length.
and solving equation (16) for the coherence time we get
Numerical evaluation of equation (19) gives for the coherence time [tau], the magnitude
They were also able to achieve a fourfold prolonged coherence time
of the light emission.
The intervals between transmissions of the same symbol should be at least the coherence time
so that different copies of the same symbol undergo independent fading.
Active optical clocks provide several new possibilities of applications: (i) more stable optical clock than any current atomic clocks; (ii) sub-natural linewidth laser spectroscopy; (iii) long coherence time
laser with linewidth at mHz level; (iv) Ramsey laser combining stimulated emission process and Ramsey separated oscillatory fields method," commented Professor Yiqiu Wang.
Organic semiconductors (OSC) can play an important role in the development of spintronics as they have very small spin-orbit and hyperfine interactions, which lead to very long spin coherence times
and make them ideal for spin transport.
Josephson junctions are good candidates for a quantum computer with recent experiments demonstrating reasonably long coherence times
, state preparation, manipulation and measurement, and coupling of qubits for even-tual gate operations.
Since spins can have coherence times
in the seconds range, this could pave the way towards a scalable implementation of quantum information processing protocols.
The incredibly long coherence times
of atomic hyperfine states make them ideally suited for frequency standards and quantum information processing.
Recent measurements have demonstrated coherence times
exceeding 100 s--corresponding to over 10 x [10.