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QIS at UBC

单位:University of British Columbia

研究方向:Quantum Information and Computation, QI and foundational aspects of quantum mechanics

个人主页: http://www.qi.ubc.ca/


Research 

Quantum Information and Computation

QI and foundational aspects of quantum mechanics

Qubits with photons, quantum dots (Experiment)

Fault-tolerance and decoherence

Entanglement



Our work is in quantum information, ranging from theoretical work on `Models of quantum computation' and quantum fault-tolerance to experiments on decoherence, quantum dots and topologically protected qubits.


Featured publication: Experimental demonstration of topological error correction. [Posted June 7, 2012] Here we report the experimental demonstration of topological error correction with an eight-photon cluster state. We show that a correlation can be protected against a single error on any quantum bit. Also, when all quantum bits are simultaneously subjected to errors with equal probability, the effective error rate can be significantly reduced. Our work demonstrates the viability of topological error correction for fault-tolerant quantum information processing.


The present experiment uses an 8-qubit cluster state which shares topological features with its larger (potentially much larger) cousin, the three-dimensional cluster state. A 3D cluster state is for measurement-based quantum computation (MBQC) what the Kitaev surface code is for the circuit model: a fault-tolerant fabric in which protected quantum gates can be implemented in a topological fashion. The present experiment demonstrates the fault-tolerance properties, not yet the encoded quantum gates. For the latter, larger cluster states will be required in future experiments. The smallest possible setting to demonstrate topological error-correction with cluster states requires 8 qubits, which was just in reach of the present photon-based experiment.

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