Atom-ion quantum gate

Journal Article · Fri Jan 15 00:00:00 EST 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.81.012708· OSTI ID:21388733

Doerk, Hauke ^[1]; Idziaszek, Zbigniew ^[2]; Calarco, Tommaso ^[1]; ECT, I-38050 Villazzano ^[3]

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1. University of Ulm, Albert-Einstein-Allee 11, D-89069 Ulm (Germany)
2. Institute of Theoretical Physics, Faculty of Physics, University of Warsaw, Hoza 69, PL-00-681 Warsaw (Poland)
3. Italy

Ultracold collisions of ions with neutral atoms in traps are studied. Recently, ultracold atom-ion systems have become available in experimental setups, where their quantum states can be coherently controlled. This control allows for an implementation of quantum information processing, combining the advantages of charged and neutral particles. The state-dependent dynamics that is a necessary ingredient for quantum computation schemes is provided in this case by the short-range interaction forces that depend on the hyperfine states of both particles. In this work, a theoretical description of spin-state-dependent trapped atom-ion collisions is developed in the framework of a multichannel quantum-defect theory and an effective single-channel model is formulated that reduces the complexity of the problem. Based on this description, a two-qubit phase gate between a {sup 135}Ba{sup +} ion and a {sup 87}Rb atom is simulated using a realistic combination of the singlet and triplet scattering lengths. The gate process is optimized and accelerated with the help of optimal control techniques. The result is a gate fidelity of 1-10{sup -3} within 350 mus.

• OSTI ID: 21388733
• Journal Information: Physical Review. A, Vol. 81, Issue 1; Other Information: DOI: 10.1103/PhysRevA.81.012708; (c) 2010 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
ATOMS
INTERACTION RANGE
ION-ATOM COLLISIONS
IONS
NEUTRAL PARTICLES
OPTIMAL CONTROL
QUANTUM COMPUTERS
QUANTUM INFORMATION
QUANTUM MECHANICS
RUBIDIUM 87
SCATTERING LENGTHS
SIMULATION
SPIN
TRAPPING
TRAPS
TRIPLETS
ANGULAR MOMENTUM
ATOM COLLISIONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CHARGED PARTICLES
COLLISIONS
COMPUTERS
CONTROL
DIMENSIONS
DISTANCE
INFORMATION
INTERMEDIATE MASS NUCLEI
ION COLLISIONS
ISOTOPES
LENGTH
MECHANICS
MULTIPLETS
NUCLEI
ODD-EVEN NUCLEI
PARTICLE PROPERTIES
RADIOISOTOPES
RUBIDIUM ISOTOPES
YEARS LIVING RADIOISOTOPES