Trapped ion quantum computer

Chip ion trap for quantum computing from 2011 at NIST.

A trapped ion quantum computer is one proposed approach to a large-scale quantum computer. Ions, or charged atomic particles, can be confined and suspended in free space using electromagnetic fields. Qubits are stored in stable electronic states of each ion, and quantum information can be transferred through the collective quantized motion of the ions in a shared trap (interacting through the Coulomb force). Lasers are applied to induce coupling between the qubit states (for single qubit operations) or coupling between the internal qubit states and the external motional states (for entanglement between qubits).[1]

The fundamental operations of a quantum computer have been demonstrated experimentally with the currently highest accuracy in trapped ion systems. Promising schemes in development to scale the system to arbitrarily large numbers of qubits include transporting ions to spatially distinct locations in an array of ion traps, building large entangled states via photonically connected networks of remotely entangled ion chains, and combinations of these two ideas. This makes the trapped ion quantum computer system one of the most promising architectures for a scalable, universal quantum computer. As of April 2018, the largest number of particles to be controllably entangled is 20 trapped ions.[2][3][4]

  1. ^ Cite error: The named reference :0 was invoked but never defined (see the help page).
  2. ^ Friis, Nicolai; Marty, Oliver; Maier, Christine; Hempel, Cornelius; Holzäpfel, Milan; Jurcevic, Petar; Plenio, Martin B.; Huber, Marcus; Roos, Christian (2018-04-10). "Observation of Entangled States of a Fully Controlled 20-Qubit System". Physical Review X. 8 (2): 021012. arXiv:1711.11092. Bibcode:2018PhRvX...8b1012F. doi:10.1103/PhysRevX.8.021012. S2CID 59462121.
  3. ^ Monz, Thomas; Schindler, Philipp; Barreiro, Julio; Chwalla, Michael; Nigg, Daniel; Coish, William; Harlander, Maximilian; Haensel, Wolfgang; Hennrich, Markus; Blatt, Rainer (March 31, 2011), "14-Qubit Entanglement: Creation and Coherence", Physical Review Letters, 106 (13): 130506, arXiv:1009.6126, Bibcode:2011PhRvL.106m0506M, doi:10.1103/PhysRevLett.106.130506, PMID 21517367, S2CID 8155660
  4. ^ Paul, Wolfgang (1990-07-01). "Electromagnetic traps for charged and neutral particles". Reviews of Modern Physics. 62 (3): 531–540. Bibcode:1990RvMP...62..531P. doi:10.1103/revmodphys.62.531. ISSN 0034-6861.

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