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Topological quantum memory

- E. Dennis, A. Kitaev, A. Landahl, J. Preskill
- Physics
- 24 October 2001

We analyze surface codes, the topological quantum error-correcting codes introduced by Kitaev. In these codes, qubits are arranged in a two-dimensional array on a surface of nontrivial topology, and… Expand

Perfect state transfer in quantum spin networks.

- M. Christandl, N. Datta, A. Ekert, A. Landahl
- Physics, Medicine
- Physical review letters
- 17 September 2003

TLDR

Perfect Transfer of Arbitrary States in Quantum Spin Networks

- M. Christandl, N. Datta, T. Dorlas, A. Ekert, A. Kay, A. Landahl
- Physics
- 2 November 2004

We propose a class of qubit networks that admit perfect state transfer of any two-dimensional quantum state in a fixed period of time. We further show that such networks can distribute arbitrary… Expand

Quantum computing by color-code lattice surgery

- A. Landahl, C. Ryan-Anderson
- Physics, Mathematics
- 1 July 2014

We demonstrate how to use lattice surgery to enact a universal set of fault-tolerant quantum operations with color codes. Along the way, we also improve existing surface-code lattice-surgery methods.… Expand

Continuous quantum error correction via quantum feedback control

- C. Ahn, A. Doherty, A. Landahl
- Physics
- 18 October 2001

We describe a protocol for continuously protecting unknown quantum states from decoherence that incorporates design principles from both quantum error correction and quantum feedback control. Our… Expand

Complex instruction set computing architecture for performing accurate quantum $Z$ rotations with less magic

- A. Landahl, C. Cesare
- Mathematics, Computer Science
- 1 February 2013

TLDR

Fault-tolerant quantum computing with color codes

- A. Landahl, Jonas T. Anderson, P. Rice
- Mathematics, Physics
- 29 August 2011

We present and analyze protocols for fault-tolerant quantum computing using color codes. We present circuit-level schemes for extracting the error syndrome of these codes fault-tolerantly. We further… Expand

Quantum algorithms for the ordered search problem via semidefinite programming

- Andrew M. Childs, A. Landahl, P. Parrilo
- Physics
- 21 August 2006

One of the most basic computational problems is the task of finding a desired item in an ordered list of $N$ items. While the best classical algorithm for this problem uses… Expand

Two-Atom Rydberg Blockade using Direct 6S to nP Excitation

- A. Hankin, Y. Jau, +4 authors G. Biedermann
- Physics
- 9 January 2014

We explore a single-photon approach to Rydberg state excitation and Rydberg blockade. Using detailed theoretical models, we show the feasibility of direct excitation, predict the effect of background… Expand

Quantum search by measurement

- Andrew M. Childs, E. Deotto, E. Farhi, J. Goldstone, S. Gutmann, A. Landahl
- Physics
- 3 April 2002

We propose a quantum algorithm for solving combinatorial search problems that uses only a sequence of measurements. The algorithm is similar in spirit to quantum computation by adiabatic evolution,… Expand

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