Universal quantum error correction with nuclear spins in diamond


Quantum mechanical superposition states enable a powerful new way to process information and perform computations. These quantum superpositions are, however, extremely fragile: small errors continuously accumulate to inevitably destroy the quantum state. Large-scale quantum information processing therefore appears impossible without a method to correct errors.
A quantum state can be protected against errors by encoding it in an entangled state of multiple quantum bits (qubits). Ancillary qubits are then used to detect and correct errors without obtaining information about the encoded state. The uninterrupted protection of a quantum state against arbitrary single-qubit errors requires at least five encoding qubits and one ancillary qubit. These demanding requirements have so far hindered experimental implementations, and the extent to which realistic errors in a quantum state can be corrected remains an open question.
I propose to experimentally protect a quantum state against arbitrary single-qubit errors. For this, I will encode the state in five nuclear spins in diamond. Errors are detected by performing quantum measurements of joint properties using a nearby electron spin as ancillary qubit. The errors are subsequently corrected by fast feedback. This ambitious research plan optimally exploits two recent advances with spins in diamond, realized by my colleagues and me, to achieve one of the most sought-after goals in quantum science and technology today.
The proposed research is an important step towards fault-tolerant implementations of complex quantum algorithms. It will provide new experimental insight into the fundamental question: can a quantum state be protected indefinitely? Additionally, for this project I will develop a new quantum toolbox that enables the experimental exploration of large entangled states and quantum measurements, as well as topological protection schemes, quantum-teleportation-based computing and one-way computing.


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Dr. T.H. Taminiau

Verbonden aan

Technische Universiteit Delft, Faculteit Technische Natuurwetenschappen, NanoScience - Kavli Institute of Nanoscience Delft


Dr. T.H. Taminiau


01/03/2014 tot 27/06/2017