Bang–bang control of fullerene qubits using ultrafast phase gates

By J. Morton, A. Tyryshkin, A. Ardavan, Simon C. Benjamin, Kyriakos Porfyrakis, S. Lyon, G. Briggs. 2006

186 citations recorded by the source corpus.

Quantum mechanics permits an entity, such as an atom, to exist in a superposition of multiple states simultaneously. Quantum information processing (QIP) harnesses this profound phenomenon to manipulate information in radically new ways1. A fundamental challenge in all QIP technologies is the corruption of superposition in a quantum bit (qubit) through interaction with its environment. Quantum bang–bang control provides a solution by repeatedly applying ‘kicks’ to a qubit2, thus disrupting an environmental interaction. However, the speed and precision required for the kick operations has presented an obstacle to experimental realization. Here we demonstrate a phase gate of unprecedented speed3,4 on a nuclear spin qubit in a fullerene molecule, and use it to bang–bang decouple the qubit from a strong environmental interaction. We can thus trap the qubit in closed cycles on the Bloch sphere, or lock it in a given state for an arbitrary period. Our procedure uses operations on a second qubit, an electron spin, to generate an arbitrary phase on the nuclear qubit. We anticipate that the approach will be important for QIP technologies, especially at the molecular scale where other strategies, such as electrode switching, are unfeasible.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/e50016b610c94bb7573611b098eac7bebd577d8a

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In Artificial Intelligence

In Atomic and Molecular Physics, and Optics

Citations in the corpus

Quantum entanglement between an optical photon and a solid-state spin qubit (2010, methodology): “This sequence is in spirit similar to the Bang-Bang decoupling technique[11].”
A quantum spin transducer based on nanoelectromechanical resonator arrays (2009, methodology): “Prolonged storage times and techniques for the implementation of gate operations between nuclear and electronic spins on a 10 −100 ns timescale have already been demonstrated in several e xperiments [6, 9, 11, 16].”
Quantum computers (2010, unknown): “The carbon-based nanomaterials of fullerenes 86 , nanotubes 87 and graphene 88 have excellent properties for hosting arrays of electron-based qubits.”