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Quantum Physics, quant-ph
Abstract:
We investigate several aspects of realizing quantum computation using
entangled polar molecules in pendular states. Quantum algorithms typically
start from a product state |00...0> and we show that up to a negligible error,
the ground states of polar molecule arrays can be considered as the unentangled
qubit basis state |00...0>. This state can be prepared by simply allowing the
system to reach thermal equilibrium at low temperature (<1 mK). We also
evaluate entanglement, characterized by the concurrence of pendular state
qubits in dipole arrays as governed by the external electric field,
dipole-dipole coupling and number N of molecules in the array. In the parameter
regime that we consider for quantum computing, we find that qubit entanglement
is modest, typically no greater than 0.0001, confirming the negligible
entanglement in the ground state. We discuss methods for realizing quantum
computation in the gate model, measurement based model, instantaneous quantum
polynomial time circuits and the adiabatic model using polar molecules in
pendular states.
