Single-Qubit Operations for Singlet-Triplet Qubits in an Isolated Double-Well with Fixed Tunneling
QIAN Jun1, QIAN Yong2, KE Min1, YAN Bo1, CHENG Feng1, ZHOU Shu-Yu1, WANG Yu-Zhu1
1Key Laboratory for Quantum Optics, Center of Cold Atom Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800 2Department of Modern Physics, University of Science and Technology of China, Hefei 230026
Single-Qubit Operations for Singlet-Triplet Qubits in an Isolated Double-Well with Fixed Tunneling
QIAN Jun1, QIAN Yong2, KE Min1, YAN Bo1, CHENG Feng1, ZHOU Shu-Yu1, WANG Yu-Zhu1
1Key Laboratory for Quantum Optics, Center of Cold Atom Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800 2Department of Modern Physics, University of Science and Technology of China, Hefei 230026
摘要We propose a scheme to implement single-qubit operations for singlet-triplet qubits located in an isolated double-well potential with fixed inter-site tunneling when superexchange interactions predominate. Arbitrary single-qubit gates can be realized by a sequence composed of two elementary operations which can be switched between different parameter regimes by adjusting slightly the relative energy bias of trapped atoms in each sub-well site. The experimental feasibility of the strategy and the fidelity of basic rotation operations are also analyzed.
Abstract：We propose a scheme to implement single-qubit operations for singlet-triplet qubits located in an isolated double-well potential with fixed inter-site tunneling when superexchange interactions predominate. Arbitrary single-qubit gates can be realized by a sequence composed of two elementary operations which can be switched between different parameter regimes by adjusting slightly the relative energy bias of trapped atoms in each sub-well site. The experimental feasibility of the strategy and the fidelity of basic rotation operations are also analyzed.
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2010, Vol. 27 
