Effect of exchange interaction on fidelity of quantum state transfer from a photon qubit to an electron-spin qubit

Details Effect of exchange interaction on fidelity of quantum state transfer from a photon qubit to an electron-spin qubit Effect of exchange interaction on fidelity of quantum state transfer from a photon qubit to an electron-spin qubit

2006-08-24

arxiv.org/abs/quant-ph/0608188v1

Physics

Quantum Physics

5 pages, 4 figures, to be published in Phys. Rev. B Rapid Communications

Scientific paper

10.1103/PhysRevB.74.081307

We analyzed the fidelity of the quantum state transfer (QST) from a photon-polarization qubit to an electron-spin-polarization qubit in a semiconductor quantum dot, with special attention to the exchange interaction between the electron and the simultaneously created hole. In order to realize a high-fidelity QST we had to separate the electron and hole as soon as possible, since the electron-hole exchange interaction modifies the orientation of the electron spin. Thus, we propose a double-dot structure to separate the electron and hole quickly, and show that the fidelity of the QST can reach as high as 0.996 if the resonant tunneling condition is satisfied.

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