## 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 ^{43}Ca^{+} 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

### 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

### 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

### 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

**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

### 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

**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

### 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

**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

**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

**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

**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

**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

**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

### 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

**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

**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

### 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

**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

### 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

**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

### 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

### 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

**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

**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

**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

### 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

**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

### 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

**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

**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

**Fast quantum logic by selective displacement of hot trapped ions**

M. Sasura, A. M. Steane

*Phys. Rev. A,* Vol. 67, Issue 6, pp. 062318

### 2002

**Quantum computer architecture for fast entropy extraction**

A. M. Steane

*Quantum Information and Computation* 2, pp. 297-306

### 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

**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

**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 **^{2}D_{5/2} state in ^{40}Ca^{+}

^{2}D

_{5/2}state in

^{40}Ca

^{+}

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

### 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

### 1997

**Active stabilisation, quantum computation and quantum state synthesis**

A. M. Steane

*Phys.Rev.Lett.*, Vol. 78, Issue 11, pp. 2252-2255

**The ion trap quantum information processor**

A. M. Steane

*Applied Physics B*, Vol. 64, Issue 6, pp. 623-643

### 1996

**Simple quantum error correcting codes**

A. M. Steane

*Phys.Rev. A*, Vol. 54, Issue 6, pp. 4741