Journal publications

2021

A quantum network of entangled optical atomic clocks

B. C. Nichol, R. Srinivas, D. P. Nadlinger, P. Drmota, D. Main, G. Araneda, C. J. Ballance, D. M. Lucas
(Preprint)

Device-Independent Quantum Key Distribution

D. P. Nadlinger, P. Drmota, B. C. Nichol, G. Araneda, D. Main, R. Srinivas, D. M. Lucas, C. J. Ballance, K. Ivanov, E. Y-Z. Tan, P. Sekatski, R. L. Urbanke, R. Renner, N. Sangouard, J-D. Bancal
(Preprint)

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
Phys. Rev. A 104, 052804
(Article, Preprint)

Universal hybrid quantum computing in trapped ions

R. T. Sutherland and R. Srinivas
(ArticlePreprint)

 

2020

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)

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

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

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)

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)

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)

 

2012

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)

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)

 

2011

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)

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)

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)

 

2010

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)

 

2009

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)

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)

 

2008

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)

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)

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)

 

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)

 

2006

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)

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)

 

2004

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)

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)

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)

Further quantum-gate methods using selective displacement of trapped ions

M. Sasura, A. M. Steane
(Preprint)

 

2003

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)

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)

 

2002

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)

Overhead and noise threshold of fault-tolerant quantum error correction

A. M. Steane
Phys. Rev. A, Vol. 68, Issue 4, pp. 042322
(Article, Preprint)

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

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)

Quantum computing and error correction

A. M. Steane
(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)

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)

 

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

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

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

A. M. Steane
Fortsch.Phys., Vol. 46, pp. 443
(Preprint)

 

1996

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)

Simple quantum error correcting codes

A. M. Steane
Phys.Rev. A, Vol. 54, Issue 6, pp. 4741
(Article, Preprint)

 

1995

Multiple Particle Interference and Quantum Error Correction

A. M. Steane
Proc. R. Soc. Lond. A, Vol. 452, pp. 2551-2577
(Article, Preprint)