A Study Of Implementing The Deutsch-Jozsa Algorithm With Double Quantum Dot Molecules

Quantum information science is a new subject combining quantum mechanics and classical information theory. It mainly includes two branches, namely, quantum communication and quantum computation. Due to quantum superposition principle and entanglement properties, quantum computer can solve certain problems quickly compared with its classical counterpart, which shows that quantum computer has powerful ability for computing and information processing. At present, the realization of quantum algorithm in different physical systems is one of the hot problems of quantum information field. Due to easy to manipulate and integrate, the solid state system of semiconductor quantum dot attracts much attention of scientists and has become one of the most possible candidates for indeed realizing quantum computation.We present a scheme for implementing the Deutsch-Jozsa algorithm with double quantum dot molecules. In the scheme, qubit is encoded on the singlet state and the triplet state of two-electron spin states in double coupled quantum dots. And Coulomb interaction between two qubits can be effectively reduced to the form of the Ising-model interaction. It is shown from the definite analyses of the physical parameters that our scheme might be experimentally realizable with the present double-dot molecule techniques. Encoding qubits on the singlet state and the triplet state can protect qubits from low-frequency noise and suppress the dominant source of decoherence from hyperfine interactions. Moreover, this scheme would be an important step toward more complex quantum computation via double-dot molecules. We believe that our scheme may be helpful to further understand the application of double-dot molecules to quantum information processing.