TY - JOUR

T1 - Gapped Two-Body Hamiltonian for Continuous-Variable Quantum Computation

AU - Aolita, Leandro

AU - Roncaglia, Augusto J.

AU - Ferraro, Alessandro

AU - Acín, Antonio

PY - 2011/2/28

Y1 - 2011/2/28

N2 - We introduce a family of Hamiltonian systems for measurement-based quantum computation with continuous variables. The Hamiltonians (i) are quadratic, and therefore two body, (ii) are of short range, (iii) are frustration-free, and (iv) possess a constant energy gap proportional to the squared inverse of the squeezing. Their ground states are the celebrated Gaussian graph states, which are universal resources for quantum computation in the limit of infinite squeezing. These Hamiltonians constitute the basic ingredient for the adiabatic preparation of graph states and thus open new venues for the physical realization of continuous-variable quantum computing beyond the standard optical approaches. We characterize the correlations in these systems at thermal equilibrium. In particular, we prove that the correlations across any multipartition are contained exactly in its boundary, automatically yielding a correlation area law.

AB - We introduce a family of Hamiltonian systems for measurement-based quantum computation with continuous variables. The Hamiltonians (i) are quadratic, and therefore two body, (ii) are of short range, (iii) are frustration-free, and (iv) possess a constant energy gap proportional to the squared inverse of the squeezing. Their ground states are the celebrated Gaussian graph states, which are universal resources for quantum computation in the limit of infinite squeezing. These Hamiltonians constitute the basic ingredient for the adiabatic preparation of graph states and thus open new venues for the physical realization of continuous-variable quantum computing beyond the standard optical approaches. We characterize the correlations in these systems at thermal equilibrium. In particular, we prove that the correlations across any multipartition are contained exactly in its boundary, automatically yielding a correlation area law.

UR - http://www.scopus.com/inward/record.url?partnerID=yv4JPVwI&eid=2-s2.0-79952130483&md5=cfc390eaa95898c043252d9a63fc152c

U2 - 10.1103/PhysRevLett.106.090501

DO - 10.1103/PhysRevLett.106.090501

M3 - Article

AN - SCOPUS:79952130483

SN - 0031-9007

VL - 106

SP - 1

EP - 4

JO - Physical Review Letters

JF - Physical Review Letters

IS - 9

M1 - 090501

ER -