# Toward a scalable quantum computing architecture with mixed species ion chains

Toward a scalable quantum computing architecture with mixed species ion chains We report on progress toward implementing mixed ion species quantum information processing for a scalable ion-trap architecture. Mixed species chains may help solve several problems with scaling ion-trap quantum computation to large numbers of qubits. Initial temperature measurements of linear Coulomb crystals containing barium and ytterbium ions indicate that the mass difference does not significantly impede cooling at low ion numbers. Average motional occupation numbers are estimated to be $$\bar{n} \approx 130$$ n ¯ ≈ 130 quanta per mode for chains with small numbers of ions, which is within a factor of three of the Doppler limit for barium ions in our trap. We also discuss generation of ion–photon entanglement with barium ions with a fidelity of $$F \ge 0.84$$ F ≥ 0.84 , which is an initial step towards remote ion–ion coupling in a more scalable quantum information architecture. Further, we are working to implement these techniques in surface traps in order to exercise greater control over ion chain ordering and positioning. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Quantum Information Processing Springer Journals

# Toward a scalable quantum computing architecture with mixed species ion chains

11 pages

/lp/springer_journal/toward-a-scalable-quantum-computing-architecture-with-mixed-species-v3xkzKAeYt
Publisher
Springer Journals
Subject
Physics; Quantum Information Technology, Spintronics; Quantum Computing; Data Structures, Cryptology and Information Theory; Quantum Physics; Mathematical Physics
ISSN
1570-0755
eISSN
1573-1332
D.O.I.
10.1007/s11128-015-1220-9
Publisher site
See Article on Publisher Site

### Abstract

We report on progress toward implementing mixed ion species quantum information processing for a scalable ion-trap architecture. Mixed species chains may help solve several problems with scaling ion-trap quantum computation to large numbers of qubits. Initial temperature measurements of linear Coulomb crystals containing barium and ytterbium ions indicate that the mass difference does not significantly impede cooling at low ion numbers. Average motional occupation numbers are estimated to be $$\bar{n} \approx 130$$ n ¯ ≈ 130 quanta per mode for chains with small numbers of ions, which is within a factor of three of the Doppler limit for barium ions in our trap. We also discuss generation of ion–photon entanglement with barium ions with a fidelity of $$F \ge 0.84$$ F ≥ 0.84 , which is an initial step towards remote ion–ion coupling in a more scalable quantum information architecture. Further, we are working to implement these techniques in surface traps in order to exercise greater control over ion chain ordering and positioning.

### Journal

Quantum Information ProcessingSpringer Journals

Published: Jan 12, 2016

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