Abstract
We propose schemes for the efficient information transfer between a propagating
photon and a quantum-dot (QD) spin qubit in an optical microcavity that have no
auxiliary particles required. With these methods, the information transfer between two
photons or two QD spins can also be achieved. All of our proposals can work with high
fidelity, even with a high leakage rate. What is more, each information transfer process
above can also be seen as a controlled-NOT (CNOT) operation. It is found that the
information transfer can be equivalent to a CNOT gate. These proposals will promote more
efficient quantum information networks and quantum computation.
© 2016 Chinese Laser Press
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