One-Step Generation of Scalable Multiparticle Entanglement for Hot Ions Driven by a Standing-Wave Laser

Abstract

An alternative scheme is proposed for one-step generation of multiparticle cluster state with trapped ions in thermal motion. In this scheme, the ions are simultaneously illuminated by a standing-wave laser tuned to the carrier. During the operations, the vibrational mode is virtually excited, thus the quantum operations are insensitive to the heating. It is shown that the high fidelity multiparticle entanglement could be generated in just one step even including the small fluctuations of parameters. In addition, the ion does not need to be exactly positioned at the node of the standing wave, which is also important from the viewpoint of experiment.

Simple scheme for multiqubit quantum controlled phase-flip gate with singlet-triplet spin qubits in nanowire double quantum dots

“…Many current efforts in exploring quantum computation are mainly based on externally controlled qubit-qubit interactions in various systems, such as trapped ions [2], cavity QED [3], superconducting circuits [4], semiconductor quantum dots [5], linear optics [6], etc. On the other hand, multiqubit controlled operations, such as multiqubit controlled-Not gates and multiqubit controlled phase-flip (CPS) gates [7][8][9], are very useful for quantum computation. As is well known, any quantum computation can be decomposed into a series of single-qubit and two-qubit logic gates [10].…”