Outputs (4)

The ZX calculus is a language for surface code lattice surgery (2020)
Journal Article
de Beaudrap, N., & Horsman, D. (2020). The ZX calculus is a language for surface code lattice surgery. Quantum, 4, Article 218. https://doi.org/10.22331/q-2020-01-09-218

A leading choice of error correction for scalable quantum computing is the surface code with lattice surgery. The basic lattice surgery operations, the merging and splitting of logical qubits, act non-unitarily on the logical states and are not easil... Read More about The ZX calculus is a language for surface code lattice surgery.

Can a quantum state over time resemble a quantum state at a single time? (2017)
Journal Article
Horsman, D., Heunen, C., Pusey, M. F., Barrett, J., & Spekkens, R. W. (2017). Can a quantum state over time resemble a quantum state at a single time?. Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 473(2205), Article 20170395. https://doi.org/10.1098/rspa.2017.0395

The standard formalism of quantum theory treats space and time in fundamentally different ways. In particular, a composite system at a given time is represented by a joint state, but the formalism does not prescribe a joint state for a composite of s... Read More about Can a quantum state over time resemble a quantum state at a single time?.

Quantum Common Causes and Quantum Causal Models (2017)
Journal Article
Allen, J. A., Barrett, J., Horsman, D. C., Lee, C. M., & Spekkens, R. W. (2017). Quantum Common Causes and Quantum Causal Models. Physical Review X, 7(3), Article 031021. https://doi.org/10.1103/physrevx.7.031021

Reichenbach’s principle asserts that if two observed variables are found to be correlated, then there should be a causal explanation of these correlations. Furthermore, if the explanation is in terms of a common cause, then the conditional probabilit... Read More about Quantum Common Causes and Quantum Causal Models.

Surface code error correction on a defective lattice (2017)
Journal Article
Nagayama, S., Fowler, A. G., Horsman, D., Devitt, S. J., & Meter, R. V. (2017). Surface code error correction on a defective lattice. New Journal of Physics, 19(2), Article 023050. https://doi.org/10.1088/1367-2630/aa5918

The yield of physical qubits fabricated in the laboratory is much lower than that of classical transistors in production semiconductor fabrication. Actual implementations of quantum computers will be susceptible to loss in the form of physically faul... Read More about Surface code error correction on a defective lattice.