12 research outputs found
Cryogenic silicon surface ion trap
Trapped ions are pre-eminent candidates for building quantum information
processors and quantum simulators. They have been used to demonstrate quantum
gates and algorithms, quantum error correction, and basic quantum simulations.
However, to realise the full potential of such systems and make scalable
trapped-ion quantum computing a reality, there exist a number of practical
problems which must be solved. These include tackling the observed high
ion-heating rates and creating scalable trap structures which can be simply and
reliably produced. Here, we report on cryogenically operated silicon ion traps
which can be rapidly and easily fabricated using standard semiconductor
technologies. Single Ca ions have been trapped and used to
characterize the trap operation. Long ion lifetimes were observed with the
traps exhibiting heating rates as low as 0.33 phonons/s at an
ion-electrode distance of 230 m. These results open many new avenues to
arrays of micro-fabricated ion traps.Comment: 12 pages, 4 figures, 1 tabl
Experiment towards continuous-variable entanglement swapping: Highly correlated four-partite quantum state
We present a protocol for performing entanglement swapping with intense
pulsed beams. In a first step, the generation of amplitude correlations between
two systems that have never interacted directly is demonstrated. This is
verified in direct detection with electronic modulation of the detected
photocurrents. The measured correlations are better than expected from a
classical reconstruction scheme. In the entanglement swapping process, a
four--partite entangled state is generated. We prove experimentally that the
amplitudes of the four optical modes are quantum correlated 3 dB below shot
noise, which is due to the potential four--party entanglement.Comment: 9 pages, 10 figures, update of references 9 and 10; minor
inconsistency in notation removed; format for units in the figures change
88Sr+ ion trapping techniques and technologies for quantum information processing
EThOS - Electronic Theses Online ServiceGBUnited Kingdo