Journal publications

2021

Micromotion minimisation by synchronous detection of parametrically excited motion

D. P. Nadlinger, P. Drmota, D. Main, B. C. Nichol, G. Araneda, R. Srinivas, L. J. Stephenson, C. J. Ballance, D. M. Lucas

(Preprint)

Precision measurement of the 43Ca+ nuclear magnetic moment

R. K. Hanley, D. T. C. Allcock, T. P. Harty, M. A. Sepiol, D. M. Lucas

(Preprint)

An optically heated atomic source for compact ion trap vacuum systems

S. Gao, W. J. Hughes, D. M. Lucas, T. G. Ballance, and J. F. Goodwin
Review of Scientific Instruments 92, 033205

(Article, Preprint)

 

2020

Effects of cavity birefringence on remote entanglement generation

E. Kassa, W. Hughes, S. Gao and J. F. Goodwin

(Preprint)

Benchmarking a high-fidelity mixed-species entangling gate

A. C. Hughes, V. M. Schäfer, K. Thirumalai, D. P. Nadlinger, S. R. Woodrow, D. M. Lucas, C. J. Ballance
Phys. Rev. Lett. 125, 080504

(Article, Preprint, Synopsis in "Physics")

 

2019

High-rate, high-fidelity entanglement of qubits across an elementary quantum network

L. J. Stephenson, D. P. Nadlinger, B. C. Nichol, S. An, P. Drmota, T. G. Ballance, K. Thirumalai, J. F. Goodwin, D. M. Lucas, C. J. Ballance
Phys. Rev. Lett. 124, 110501

(Article, Preprint, "Physics World" article)

Probing qubit memory errors at the part-per-million level

M. A. Sepiol, A. C. Hughes, J. E. Tarlton, D. P. Nadlinger, T. G. Ballance, C. J. Ballance, T. P. Harty, A. M. Steane, J. F. Goodwin and D. M. Lucas
Phys. Rev. Lett. 123, 110503

(Article, Preprint)

 

2018

Magnetic field stabilization system for atomic physics experiments

B. Merkel, K. Thirumalai, J. E. Tarlton, V. M. Schäfer, C. J. Ballance, T. P. Harty, D. M. Lucas
Rev. Sci. Instrum., Vol. 90, 044702

(Article, Preprint)

 

2017

A short response-time atomic source for trapped ion experiments

T. G. Ballance, J. F. Goodwin, B. Nichol, L. J. Stephenson, C. J. Ballance, D. M. Lucas
Rev. Sci. Instrum., Vol. 89, 053102

(Article, Preprint)

Fast quantum logic gates with trapped-ion qubits

V. M. Schäfer, C. J. Ballance, K. Thirumalai, L. J. Stephenson, T. G. Ballance, A. M. Steane and D. M. Lucas
Nature, Vol. 555, pp. 75-78

(Article, Preprint, Nature "News & Views" by Prof. Tobias Schaetz)

The effect of atomic response time in the theory of Doppler cooling of trapped ions

H. Janacek, A. M. Steane, D. M. Lucas, and D. N. Stacey
Journal of Modern Optics, Vol. 65, pp. 577-584

(Article, Preprint)

 

2016

High-fidelity trapped-ion quantum logic using near-field microwaves

T. P. Harty, M. A. Sepiol, D. T. C. Allcock, C. J. Ballance, J. E. Tarlton, D. M. Lucas
Phys. Rev. Lett. 117, 140501

(Article, Preprint)

High-fidelity spatial and polarization addressing of 43Ca+ qubits using near-field microwave control

D. P. L. Aude Craik, N. M. Linke, M. A. Sepiol, T. P. Harty, J. F. Goodwin, C. J. Ballance, D. N. Stacey, A. M. Steane, D. M. Lucas, and D. T. C. Allcock
Phys. Rev. A 95, 022337

(Article, Preprint)

 

2015

High-fidelity quantum logic gates using trapped-ion hyperfine qubits

C. J. Ballance, T. P. Harty, N. M. Linke, M. A. Sepiol, D. M. Lucas
Phys. Rev. Lett. 117, 060504

(Article, Preprint)

Dark-resonance Doppler cooling and high fluorescence in trapped Ca-43 ions at intermediate magnetic field

D. T. C. Allcock, T. P. Harty, M. A. Sepiol, H. A. Janacek, C. J. Ballance, A. M. Steane, D. M. Lucas, D. N. Stacey
New J. Phys., Vol. 18, pp. 023043

(Article, Preprint)

Optical injection and spectral filtering of high-power UV laser diodes

V. M. Schäfer, C. J. Ballance, C. J. Tock, D. M. Lucas
Opt. Lett., Vol. 40, pp. 4265-4268

(Article, Preprint)

Hybrid quantum logic and a test of Bell's inequality using two different atomic species

C. J. Ballance, V. M. Schäfer, J. P. Home, D. J. Szwer, S. C. Webster, D. T. C. Allcock, N. M. Linke, T. P. Harty, D. P. L. Aude Craik, D. N. Stacey, A. M. Steane, D. M. Lucas
Nature, Vol. 528, pp. 384–386

(Article, Preprint, Nature "News & Views" by Prof. Tobias Schaetz, "Physics World" Top 10 Breakthroughs of 2016)

 

2014

Pulsed force sequences for fast phase-insensitive quantum gates in trapped ions

A. M. Steane, G. Imreh, J. P. Home, D. Leibfried
New J. Phys., Vol. 16, pp. 053049

(Article, Preprint)

High-fidelity two-qubit quantum logic gates using trapped calcium-43 ions

C. J. Ballance, T. P. Harty, N. M. Linke, D. M. Lucas

(Preprint)

High-fidelity preparation, gates, memory and readout of a trapped-ion quantum bit

T. P. Harty, D. T. C. Allcock, C. J. Ballance, L. Guidoni, H. A. Janacek, N. M. Linke, D. N. Stacey, D. M. Lucas
Phys. Rev. Lett., Vol. 113, Issue 22, pp. 220501

(Article, Preprint, "Viewpoint: Trapped Ions Make Impeccable Qubits" by Prof. Jungsang Kim, phys.org, Nature - research highlights: "Qubits come close to perfection")

 

2013

Experimental recovery of a qubit from partial collapse

J. A. Sherman, M. J. Curtis, D. J. Szwer, D. T. C. Allcock, G. Imreh, D. M. Lucas, A. M. Steane
Phys. Rev. Lett., Vol. 111, Issue 18, pp. 180501

(Article, Preprint, phys.org, gaianews.it)

Injection locking of two frequency-doubled lasers with 3.2 GHz offset for driving Raman transitions with low photon scattering in 43Ca+

N. M. Linke, C. J. Ballance, D. M. Lucas
Optics Letters, Vol. 38, Issue 23, pp. 5087-5089

(Article, Preprint)

Microwave control electrodes for scalable, parallel, single-qubit operations in a surface-electrode ion trap

D. P. L. Aude Craik, N. M. Linke, T. P. Harty, C. J. Ballance, D. M. Lucas, A. M. Steane, D. T. C. Allcock
Applied Physics B, Vol. 114, Issue 1-2, pp. 3-10

(Article, Preprint)

Injection locking of violet laser diodes with a 3.2 GHz offset frequency for driving Raman transitions in 43Ca+

B. C. Keitch, N. R. Thomas, D. M. Lucas
Optics Letters, Vol. 38, Issue 6, pp. 830-832

(Article, Preprint)

 

2012

A microfabricated ion trap with integrated microwave circuitry

D. T. C. Allcock, T. P. Harty, C. J. Ballance, B. C. Keitch, N. M. Linke, D. N. Stacey, D. M. Lucas
Applied Physics Letters, Vol. 102, No. 4, pp. 044103

(Article, Preprint)

Background-free detection of trapped ions

N. M. Linke, D. T. C. Allcock, D. J. Szwer, C. J. Ballance, T. P. Harty, H. A. Janacek, D. N. Stacey, A. M. Steane, D. M. Lucas
Applied Physics B, Vol. 107, Issue 4, pp. 1175-1180

(Article, Preprint)

Heating rate and electrode charging measurements in a scalable, microfabricated, surface-electrode ion trap

D. T. C. Allcock, T. P. Harty, H. A. Janacek, N. M. Linke, C. J. Ballance, A. M. Steane, D. M. Lucas, R. L. Jarecki Jr., S. D. Habermehl, M. G. Blain, D. Stick, D. L. Moehring
Applied Physics B, Vol. 107, Issue 4, pp. 913-919

(Article, Preprint)

 

2011

Reduction of heating rate in a microfabricated ion trap by pulsed-laser cleaning

D. T. C. Allcock, L. Guidoni, T. P. Harty, C. J. Ballance, M. G. Blain, A. M. Steane, D. M. Lucas
New J. Phys., Vol. 13, pp. 123023

(Article, Preprint)

Keeping a single qubit alive by experimental dynamic decoupling

D. J. Szwer, S. C. Webster, A. M. Steane and D. M. Lucas
J. Phys. B: At. Mol. Opt. Phys., Vol. 44, No. 2, pp. 025501

(Article, Preprint)

 

2010

Scalable simultaneous multi-qubit readout with 99.99% single-shot fidelity

A. H. Burrell, D. J. Szwer, S. C. Webster and D. M. Lucas
Phys. Rev. A, Vol. 81, Issue 4, pp. 040302

(Article, Preprint)

Implementation of a symmetric surface electrode ion trap with field compensation using a modulated Raman effect

D. T. C. Allcock, J. A. Sherman, D. N. Stacey, A. H. Burrell, M. J. Curtis, G.Imreh, N. M. Linke, D. J. Szwer, S. C. Webster, A. M. Steane and D. M. Lucas
New J. Phys., Vol. 12, pp. 053026

(Article, Preprint)

 

2009

Memory coherence of a sympathetically cooled trapped-ion qubit

J. P. Home, M. J. McDonnell, D. J. Szwer, B. C. Keitch, D. M. Lucas, D. N. Stacey, and A. M. Steane
Phys. Rev. A., Vol. 79, Issue 5, pp. 050305

(Article, Preprint)

 

2008

High-fidelity readout of trapped-ion qubits

A. H. Myerson, D. J. Szwer, S. C. Webster, D. T. C. Allcock, M. J. Curtis, G. Imreh, J. A. Sherman, D. N. Stacey, A. M. Steane, and D. M. Lucas
Phys. Rev. Lett., Vol. 100, Issue 20, pp. 200502

(Article, Preprint)

Optical Bloch equations with multiply-connected states

D.N. Stacey, D.T.C. Allcock, D.M. Lucas, D.J. Szwer, S.C. Webster
J. Phys. B., Vol. 41, No. 8, pp. 085502

(Article)

 

2007

A long-lived memory qubit on a low-decoherence quantum bus

D. M. Lucas, B. C. Keitch, J. P. Home, G. Imreh, M. J. McDonnell, D. N. Stacey, D. J. Szwer and A. M. Steane

(Preprint)

Context, spacetime loops and the interpretation of quantum mechanics

A. M. Steane
J. Phys. A: Math. Theor., Vol. 40, No. 12, pp. 3223-3243

(Article, Preprint)

Long-lived mesoscopic entanglement outside the Lamb-Dicke regime

M. J. McDonnell, J. P. Home, D. M. Lucas, G. Imreh, B. C. Keitch, D. J. Szwer, N. R. Thomas, S. C. Webster, D. N. Stacey, A. M. Steane
Phys. Rev. Lett., Vol. 98, Issue 6, pp. 063603

(Article, Preprint)

How to build a 300 bit, 1 Giga-operation quantum computer

A. M. Steane
Quantum Information and Computation, Vol. 7, No.3, pp. 171-183

(Article, Preprint)

 

2006

Deterministic entanglement and tomography of ion spin qubits

J. P. Home, M. J. McDonnell, D. M. Lucas, G. Imreh, B. C. Keitch, D. J. Szwer, N. R. Thomas, S. C. Webster, D. N. Stacey, A. M. Steane
New J. Phys., Vol. 8, pp. 188

(Article, Preprint)

Electrode configurations for fast separation of trapped ions

J. P. Home, A. M. Steane
Quantum Information and Computation, Vol. 6, Issue 4, pp. 289-325

(Article, Preprint)

 

2004

Laser linewidth effects in quantum state discrimination by electromagnetically induced transparency

M. J. McDonnell, D. N. Stacey, A. M. Steane
Phys. Rev. A, Vol. 70, Issue 5, pp. 053802

(Article, Preprint)

High-efficiency detection of a single quantum of angular momentum by suppression of optical pumping

M. J. McDonnell, J.-P. Stacey, S. C. Webster, J. P. Home, A. Ramos, D. M. Lucas, D. N. Stacey, A. M. Steane
Phys. Rev. Lett., Vol. 93, Issue 15, pp. 153601

(Article)

Further quantum-gate methods using selective displacement of trapped ions

M. Sasura, A. M. Steane

(Preprint)

 

2003

Isotope-selective photo-ionization for calcium ion trapping

D. M. Lucas, A. Ramos, J. P. Home, M. J. McDonnell, S. Nakayama, J.-P. Stacey, S. C. Webster, D. N. Stacey, A. M. Steane
Phys. Rev. A, Vol. 69, Issue 1, pp. 012711

(Article, Preprint)

Oxford ion-trap quantum computing project

D. M. Lucas, C. J. S. Donald, J. P. Home, M. J. McDonnell, A. Ramos, D. N. Stacey, J.-P. Stacey, A. M. Steane, S. C. Webster
Philos. Transact. A Math Phys Eng Sci. 361, 1401-8

(Article)

Extracting entropy from quantum computers

A. M. Steane
Ann. Henri Poincare 4 supplement 2, pp. 799-809

(Article)

Overhead and noise threshold of fault-tolerant quantum error correction

A. M. Steane
Phys. Rev. A, Vol. 68, Issue 4, pp. 042322

(Article, Preprint)

Fast quantum logic by selective displacement of hot trapped ions

M. Sasura, A. M. Steane
Phys. Rev. A, Vol. 67, Issue 6, pp. 062318

(Article, Preprint)

 

2002

Quantum computer architecture for fast entropy extraction

A. M. Steane
Quantum Information and Computation 2, pp. 297-306

(Article, Preprint)

 

2001

Development of a linear ion trap for quantum computing

D. M. Lucas
Proc. First Int. Conf. on Experimental Implementation of Quantum Computation, pp. 91-98

(Article)

 

2000

Speed of ion-trap quantum information processors

A. M. Steane, C. F. Roos, D. Stevens, A. Mundt, D. Leibfried, F. Schmidt-Kaler, R. Blatt
Phys. Rev. A, Vol. 62, Issue 4, pp. 042305

(Article, Preprint)

Search for correlation effects in linear chains of trapped Ca+ ions

C. J. S. Donald, D. M. Lucas, P. A. Barton, M. J. McDonnell, J. P. Stacey, D. A. Stevens, D. N. Stacey, A. M. Steane
Europhys. Lett. 51, pp. 388-394

(Article, Preprint)

Quantum computing and error correction

A. M. Steane

(Preprint)

Quantum computing with trapped ions, atoms and light

A. M. Steane, D.M. Lucas
Fortschritte der Physik, Vol. 48, Issue 9-11, pp. 839–858

(Preprint)

 

1999

Measurement of the lifetime of the 3d 2D5/2 state in 40Ca+

P. A. Barton, C. J. S. Donald, D. M. Lucas, D. A. Stevens, A. M. Steane, D. N. Stacey
Phys. Rev. A, Vol. 62, Issue 3, pp. 032503

(Article, Preprint)

 

1998

Space, time, parallelism and noise requirements for reliable quantum computing

A. M. Steane
Fortsch.Phys., Vol. 46, pp. 443

(Preprint)

Simple experimental methods for trapped-ion quantum processors

D. Stevens, J. Brochard, A. M. Steane
Phys. Rev. A Vol. 58, Issue 4, pp. 2750

(Article, Preprint)

 

1997

Active stabilisation, quantum computation and quantum state synthesis

A. M. Steane
Phys.Rev.Lett., Vol. 78, Issue 11, pp. 2252-2255

(Article, Preprint)

The ion trap quantum information processor

A. M. Steane
Applied Physics B, Vol. 64, Issue 6, pp. 623-643

(Article, Preprint)

 

1996

Simple quantum error correcting codes

A. M. Steane
Phys.Rev. A, Vol. 54, Issue 6, pp. 4741

(Article, Preprint)