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Spontaneous emission suppression on arbitrary atomic transitions
Joerg Evers, Christoph H. Keitel
We propose a very simple scheme to slow down the usual exponential decay of upper state population in an atomic two level system considerably. The scheme makes use of an additional…
Dark state suppression and narrow fluorescent feature in a laser-driven lambda atom
Joerg Evers, David Bullock, Christoph H. Keitel
We discuss quantum interference effects in a three-level atom in lambda-configuration, where both transitions from the upper state to the lower states are driven by a single monoch…
Inhibiting decoherence via ancilla processes
Guihua Zeng, Christoph H. Keitel
General conditions are derived for preventing the decoherence of a single two-state quantum system (qubit) in a thermal bath. The employed auxiliary systems required for this purpo…
Asymmetrical Quantum Cryptographic Algorithm
Guihua Zeng, Carlos Saavedra, Christoph H. Keitel
A cryptographic algorithm is proposed based on fully quantum mechanical keys and ciphers. Encryption and decryption are carried out via an appropriate measurement process on entang…