title: Thermal states as universal resources for quantum computation with always-on interactions.
abstract: Measurement-based quantum computation utilizes an initial entangled resource state and proceeds with subsequent single-qubit measurements. It is implicitly assumed that the interactions between qubits can be switched off so that the dynamics of the measured qubits do not affect the computation. By proposing a model spin Hamiltonian, we demonstrate that measurement-based quantum computation can be achieved on a thermal state with always-on interactions. Moreover, computational errors induced by thermal fluctuations can be corrected and thus the computation can be executed fault tolerantly if the temperature is below a threshold value.
authors: Centre for Quantum Technologies, National University of Singapore, Singapore.
authors: Ying
authors: Y
authors: Li
authors: Daniel E
authors: DE
authors: Browne
authors: Leong Chuan
authors: LC
authors: Kwek
authors: Robert
authors: R
authors: Raussendorf
authors: Tzu-Chieh
authors: TC
authors: Wei