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Arbitrary waveform generator for quantum information processing with trapped ions
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10.1063/1.4795552
/content/aip/journal/rsi/84/3/10.1063/1.4795552
http://aip.metastore.ingenta.com/content/aip/journal/rsi/84/3/10.1063/1.4795552
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Figures

Image of FIG. 1.
FIG. 1.

The distribution of durations between different tasks within a typical quantum logic process in Ref. 6 . The sum of quantum logic pulses amounts to a 100 μs duration, which is only 2% of the total duration. Computer control includes preparing electronics for the experimental sequence (including the preparation of DAC output patterns for transport), laser control sets frequencies and beam powers for quantum logic, and the largest portions are due to transport and the initialization of the motional states through Doppler and Raman sideband cooling.

Image of FIG. 2.
FIG. 2.

A flow diagram overview of the AWG. The host computer transmits waveform data via USB to the FPGA, which is stored in on-chip RAM. The FPGA transmits a 16-bit digital signal derived from its RAM to each DAC, whose output is then amplified.

Image of FIG. 3.
FIG. 3.

A master board. The key components described in the text are highlighted. The host computer communicates with the master board via USB. The FT245RL handles the interface with the XC3S500E PQ208 FPGA on up to three boards (a master and two slaves) on a shared communication channel through a board-to-board interconnect. The FPGA drives three AD9726 DACs whose output is fed to AD8250 amplifiers, which creates the final three output potentials.

Image of FIG. 4.
FIG. 4.

(a) Schematic of the ion trap electrode structure showing the two diagonally opposite segmented DC electrodes (not to scale). Outer electrodes O1 and O2 are used to fine-tune the potential while ions move over electrodes A, X, and B during the experiments in Ref. 16 . (b) Example filter compensation for electrode X during transport of an ion from over electrode A to over electrode B. The desired waveform is generated from simulation and the potentials generated by the AWG must account for filter distortion. The waveform from the AWG must overshoot in time and voltage to achieve the desired 8 μs transport potentials.

Image of FIG. 5.
FIG. 5.

A diagram of our low-pass RC filter system connected to each electrode. The indices of each passive component correspond to the filter layer, and the voltages correspond to those governed by Eq. (1) with V0 the final stage applied to the electrode. The values are {R2, R1, R0} = {820, 820, 240} Ω and {C2, C1, C0} = {1, 1, 0.82} nF.

Image of FIG. 6.
FIG. 6.

Temporal pulse shaping of a microwave signal using the AWG to specify the profile. The microwave drives the hyperfine transition in 25Mg+. Shown is the ion fluorescence vs. microwave frequency. Here ν0 = 1.7 GHz denotes the frequency splitting of the two hyperfine levels. (a) We used a rectangular pulse shape, duration 20 μs, and found the corresponding sinc2 form in frequency space. (b) We used a Gaussian pulse shape and found the corresponding Gaussian form in frequency space. The FWHM pulse duration is 45 μs, with the Gaussian tail truncated to a total duration of four times the FWHM.

Image of FIG. 7.
FIG. 7.

Laser beam amplitude modulation circuit using a single DAC channel of the AWG, a mixer, and a PI controller in a feedback loop. Feedback is derived from light reflected off of a beam splitter (BS).

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/content/aip/journal/rsi/84/3/10.1063/1.4795552
2013-03-20
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Arbitrary waveform generator for quantum information processing with trapped ions
http://aip.metastore.ingenta.com/content/aip/journal/rsi/84/3/10.1063/1.4795552
10.1063/1.4795552
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