Magnetic qubits as hardware for quantum computers

TY - JOUR

T1 - Magnetic qubits as hardware for quantum computers

AU - Tejada, J.

AU - Chudnovsky, E. M.

AU - Del Barco, E.

AU - Hernandez, J. M.

AU - Spiller, T. P.

PY - 2001/6/1

Y1 - 2001/6/1

N2 - We propose two potential realizations for quantum bits based on nanometre-scale magnetic particles of large spin S and high-anisotropy molecular clusters. In case (1) the bit-value basis states |0〉 and |1〉 are the ground and first excited spin states Sz = S and S - 1, separated by an energy gap given by the ferromagnetic resonance frequency. In case (2), when there is significant tunnelling through the anisotropy barrier, the qubit states correspond to the symmetric, |0〉, and antisymmetric, |1〉, combinations of the twofold degenerate ground state Sz = ±S. In each case the temperature of operation must be low compared to the energy gap, Δ, between the states |0〉 and |1〉. The gap Δ in case (2) can be controlled with an external magnetic field perpendicular to the easy axis of the molecular cluster. The states of different molecular clusters and magnetic particles may be entangled by connecting them by superconducting lines with Josephson switches, leading to the potential for quantum computing hardware.

AB - We propose two potential realizations for quantum bits based on nanometre-scale magnetic particles of large spin S and high-anisotropy molecular clusters. In case (1) the bit-value basis states |0〉 and |1〉 are the ground and first excited spin states Sz = S and S - 1, separated by an energy gap given by the ferromagnetic resonance frequency. In case (2), when there is significant tunnelling through the anisotropy barrier, the qubit states correspond to the symmetric, |0〉, and antisymmetric, |1〉, combinations of the twofold degenerate ground state Sz = ±S. In each case the temperature of operation must be low compared to the energy gap, Δ, between the states |0〉 and |1〉. The gap Δ in case (2) can be controlled with an external magnetic field perpendicular to the easy axis of the molecular cluster. The states of different molecular clusters and magnetic particles may be entangled by connecting them by superconducting lines with Josephson switches, leading to the potential for quantum computing hardware.

UR - http://www.scopus.com/inward/record.url?scp=0035356971&partnerID=8YFLogxK

U2 - 10.1088/0957-4484/12/2/323

DO - 10.1088/0957-4484/12/2/323

M3 - Conference article

AN - SCOPUS:0035356971

SN - 0957-4484

VL - 12

SP - 181

EP - 186

JO - Nanotechnology

JF - Nanotechnology

IS - 2

T2 - Trends in Nanotechnology (TNT 2000) Conference

Y2 - 12 October 2000 through 16 October 2000

ER -