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Advancing elements of the quantum-CCD architecture for trapped ion quantum computing

April 8, 2019 - 3:00pm to 4:00pm
Speaker: 
Susanna Todaro
Institution: 
The University of Colorado, Boulder

In the 'quantum-CCD’ architecture for scalable trapped ion quantum computation[1,2], ion qubits are transported between trapping zones dedicated to memory, readout, or gate operations. Here, we seek to address two aspects of the quantum-CCD: fast transport and trap-integrated readout. 1) Qubit readout is typically performed by imaging ion fluorescence using high-NA objectives; however, these this approach does not scale easily to parallel ion readout across spatially separated trap zones. One solution integrates multiple photon detectors into the trap electrodes as separate readout devices. With short detector-ion distances, these would see a large fraction of the photons emitted from an ion in a readout zone but be less sensitive to distant ions. I will report results from a single trap-integrated superconducting nanowire single-photon detector (SNSPD) used for ion readout. 2) In most prior quantum-CCD experiments, ion transport between zones has been performed adiabatically, which generally takes an order of magnitude more time than typical laser-driven gate operations. I will report progress towards fast ion transport with low net motional excitation in a cryogenic surface-electrode trap using a new scheme offering increased tunability, which may help to transport multiple ions.

[1] Wineland et al., J Res NIST 103, 259 (1998)

[2] D. Kielpinski, C. Monroe, and D. J. Wineland, Nature 417, 709 (2002)

PSC 2136
College Park, MD 20742