Publication

Logical Qubit in a Linear Array of Semiconductor Quantum Dots

01/06/2018

C Jones, MA Fogarty, A Morello, MF Gyure, AS Dzurak, TD Ladd

Phys. Rev. X, 8, 021058 (2018)

Logical Qubit in a Linear Array of Semiconductor Quantum Dots

We design and analyze a logical qubit composed of a linear array of electron spins in semiconductor quantum dots. To avoid the difficulty of fully controlling a two-dimensional array of dots, we adapt spin control and error correction to a one-dimensional line of silicon quantum dots. Control speed and efficiency are maintained via a scheme in which electron spin states are controlled globally using broadband microwave pulses for magnetic resonance while two-qubit gates are provided by local electrical control of the exchange interaction between neighboring dots. Error correction with two-, three-, and four-qubit codes is adapted to a linear chain of qubits with nearest-neighbor gates. We estimate an error correction threshold of 1e-4. Furthermore, we describe a sequence of experiments to validate the methods on near-term devices starting from four coupled dots.

University: UNSW Sydney

Authors Centre Participants: Prof. Andrea Morello, Prof. Andrew S. Dzurak, C Jones, MA Fogarty, A Morello, MF Gyure, AS Dzurak, TD Ladd

Source: Physical Review X

Publication Type: Refereed Journal article

DOI Link: DOI Link

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