Capacitive arrangement for qubit operations

Details Capacitive arrangement for qubit operations Capacitive arrangement for qubit operations

2007-10-29

2010-11-09

Phan, Trong (Department: 2827)

Static information storage and retrieval

Radiant energy

C365S114000, C365S162000, C257S014000

Reexamination Certificate

active

07830695

ABSTRACT:
A capacitive operation method for quantum computing is disclosed where providing a sequence of write pulses above a threshold voltage induces a single charge population, forming a quantum dot (Q-dot). Determining if the single charge population was induced in the Q-dot occurs by monitoring capacitance changes while the writing is performed. Q-bits (Q-dot pairs) are formed without requiring a separate transistor for each Q-dot by multiplexing the calibration. A device which is able to perform the above method is also disclosed. The device utilizes the ability of cryogenic capacitance bridge circuits to measure the capacitance change caused by the introduction of a single charge population to a Q-dot. The device also permits swapping of Q-dot and Q-bit pairs utilizing a signal multiplexed with the voltage pulses that write (e.g. change the charge population) to the Q-dots.

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Beenakker et al., “Charge Detection Enables Free-Electron Quantum Computation,” Physical Review Letters, vol. 93, Jul. 2004.

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