title: Universal nonadiabatic geometric gates in two-qubit decoherence-free subspaces.
abstract: Geometric quantum computation in decoherence-free subspaces is of great practical importance because it can protect quantum information from both control errors and collective dephasing. However, previous proposed schemes have either states leakage or four-body interactions problems. Here, we propose a feasible scheme without these two problems. Our scheme is realized in two-qubit decoherence-free subspaces. Since the Hamiltonian we use is generic, our scheme looks promising to be demonstrated experimentally in different systems, including superconducting charge qubits.
authors.affiliation: 1] State Key Laboratory of Low-dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, China [2] Tsinghua National Laboratory of Information Science and Technology, Beijing 100084, China.
authors.forename: Guofu
authors.initials: G
authors.lastname: Xu
authors.affiliation: 1] State Key Laboratory of Low-dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, China [2] Tsinghua National Laboratory of Information Science and Technology, Beijing 100084, China.
authors.forename: Guilu
authors.initials: G
authors.lastname: Long