Integrated optics approach towards ion trap quantum computation (original) (raw)

Design and Characterization of MEMS Micromirrors for Ion-Trap Quantum Computation

IEEE Journal of Selected Topics in Quantum Electronics, 2000

To build a large-scale quantum information processor (QIP) based on trapped ions or neutral atoms, integrated optical systems capable of delivering laser beams to multiple target locations are necessary. We consider a beam-shifting element consisting of a tilting micromirror located at the focal point of a lens, as a fundamental building block for such a system. We explore the design space of the micromirrors and characterize their dc, frequency, and transient responses. The fastest mirror features the resonant frequency of 113 kHz and the 98% settling time of 11 µs. The design tradeoffs are discussed to facilitate further optimization of the mirror performance for this application.

Microscopic Surface-Electrode Ion Trap for Scalable Quantum Information Processing

Chinese Physics Letters, 2012

In this paper we try to develop a scalable surface-electrode architecture for ion trap quantum information processing. The confinement of the ions by the rf pseudopotential and the movement of the ions by changing the rf pseudopotential are investigated by numerical simulation. Particular concern is paid to the +-shaped junction, which is the connection of different components of the architecture, and also on the place which yields heat and escaping ions. We show the feasibility of fabricating and operating on the architecture for quantum information processing with currently available technology.

Geometric phase gate on an optical transition for ion trap quantum computation

Physical Review A, 2008

We propose a geometric phase gate of two ion qubits that are encoded in two levels linked by an optical dipole-forbidden transition. Compared to hyperfine geometric phase gates mediated by electric dipole transitions, the gate has many interesting properties, such as very low spontaneous emission rates, applicability to magnetic field insensitive states, and use of a co-propagating laser beam geometry. We estimate that current technology allows for infidelities of around 10 −4 .

Single qubit manipulation in a microfabricated surface electrode ion trap

New Journal of Physics, 2013

We trap individual 171 Yb + ions in a surface trap microfabricated on a silicon substrate, and demonstrate a complete set of high fidelity single qubit operations for the hyperfine qubit. Trapping times exceeding 20 min without laser cooling, and heating rates as low as 0.8 quanta ms −1 , indicate stable trapping conditions in these microtraps. A coherence time of more than 1 s, high fidelity qubit state detection and single qubit rotations are demonstrated. The observation of low heating rates and demonstration of high quality single qubit gates at room temperature are critical steps toward scalable quantum information processing in microfabricated surface traps.

A grooved planar ion trap design for scalable quantum information processing

Chinese Physics B, 2012

We describe a new electrode design for a grooved surface-electrode ion trap, which is fabricated in printed-circuitboard technology with segmented electrodes. This design allows a laser beam to get through the central groove to avoid optical access blocking and laser scattering from the ion trap surface. The confining potentials are modeled both analytically and numerically. We optimize the radio frequency (rf) electrodes and dc electrodes to achieve the maximum trap depth for a given ion height above the trap electrodes. We also compare our design with the reality ion chip MI I for practical considerations. Comparison results show that our design is superior to MI I. This ion trap design may form the basis for large scale quantum computers or parallel quadrupole mass spectrometers.

Large-scale quantum computation in an anharmonic linear ion trap

EPL (Europhysics Letters), 2009

We propose a large-scale quantum computer architecture by stabilizing a single large linear ion chain in a very simple trap geometry. By confining ions in an anharmonic linear trap with nearly uniform spacing between ions, we show that high-fidelity quantum gates can be realized in large linear ion crystals under the Doppler temperature based on coupling to a near-continuum of transverse motional modes with simple shaped laser pulses.

Nanometer-scale optical traps using atomic state localization

Physical Review A, 2009

We suggest a scheme where a laser beam forms an optical trap with a spatial size that is much smaller than the wavelength of light. The key idea is to combine a far-off-resonant dipole trap with a scheme that localizes an atomic excitation.

Simulation of Microfabricated Linear Ion Trap

2013

Recent studies have shown a great potential of application of trapped ions in quantum information processing . Due to the stability of ion oscillation frequencies, ion traps also play a fundamental role in optical frequency standards . In turn, new fabrication methods enable the realization of compact integrated ion traps, which can simultaneously operate with multiple ions. Consequently, in order to effectively use a large number of trapped ions, new scalable and feasible designs are required.