## Jeremy L O’BrienShow email address## Department of Physics, The University of Western Australia, 6009, Perth, Australia | Department of Physics, The University of Western Australia, Perth, Western Australia, ... | |

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## Jeremy L O’Brien:Expert Impact

Concepts for which**Jeremy L O’Brien**has direct influence:**Quantum interference**,**Quantum walks**,**Quantum logic**,**Single photons**,**Silicon quantum photonics**,**Chip quantum**,**Multiphoton entanglement**,**Silicon quantum**.

## Jeremy L O’Brien:KOL impact

Concepts related to the work of other authors for whichfor which Jeremy L O’Brien has influence:**Quantum computing**,**Single photons**,**Orbital angular momentum**,**Entanglement**,**States**,**Light**,**Diamond**,**Applications**,**Chip**,**Qubits**.

## KOL Resume for Jeremy L O’Brien

Year | |
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2022 | Department of Physics, The University of Western Australia, 6009, Perth, Australia |

2020 | Quantum Engineering Technology Labs, H. H. Wills Physics Laboratory and Department of Electrical & Electronic Engineering, University of Bristol, Bristol BS8 1FD, United Kingdom. School of Physics, University of Western Australia, Perth, 6009, Australia. |

2019 | Quantum Engineering Technology Labs, H.H. Wills Physics Laboratory and Department of Electrical and Electronic Engineering, University of Bristol, BS8 1FD, United Kingdom |

2018 | Quantum Engineering and Technology Laboratories, School of Physics and Department of Electrical and Electronic Engineering, University of Bristol, Bristol, UK |

2017 | Quantum Engineering Technology Labs, H. H. Wills Physics Laboratory and Department of Electrical & Electronic Engineering, University of Bristol, BS8 1FD, UK |

2016 | Centre for Quantum Photonics, H. H. Wills Physics Laboratory & Department of Electrical and Electronic Engineering, University of Bristol, Merchant Venturers Building, Woodland Road, Bristol BS8 1UB, UK |

2015 | Centre for Quantum Photonics, H. H. Wills Physics Laboratory and Department of Electrical and Electronic Engineering, University of Bristol, Merchant Venturers Building, Woodland Road, Bristol BS8 1UB, United Kingdom Dept. of Electr. & Electron. Eng., Univ. of Bristol, Bristol, UK |

2014 | Centre for Quantum Photonics, H.H. Wills Physics Laboratory & Department of Electrical and Electronic Engineering, University of Bristol, Bristol BS8 1UB, UK |

2013 | H. H. Wills Physics Laboratory & Department of Electrical and Electronic Engineering, Centre for Quantum Photonics, University of Bristol, BS8 1UB, Bristol, UK Author to whom any correspondence should be addressed. |

2012 | Centre for Quantum Photonics, H. H. Wills Physics Laboratory & Department of Electrical and Electronic Engineering, University of Bristol, Merchant Venturers Building, Woodland Road, Bristol, BS8 1UB, United Kingdom |

2011 | Centre for Quantum Photonics, H. H. Wills Physics Laboratory, Department of Electrical and Electronic Engineering, University of Bristol, Bristol BS8 1UB, United Kingdom Authors to whom any correspondence should be addressed. |

2010 | The reviewer is at the Centre for Quantum Photonics and the Department of Electrical and Electronic Engineering, University of Bristol, Bristol BS8 1UB, UK. Department of Electrical and Electronic Engineering, Centre for Quantum Photonics, H. H. Wills Physics Laboratory, University of Bristol, Merchant Venturers Building, Woodland Road, Bristol BS8 1UB, United Kingdom University of Bristol, Bristol, U.K |

2009 | H. H. Wills Physics Laboratory and the Department of Electrical and Electronic Engineering, Centre for Quantum Photonics, University of Bristol, Merchant Venturers Building, Woodland Road, BS8 1UB, Bristol, UK Department of Electrical and Electronic Engineering, University of Bristol, University Walk, Bristol BS8 1TR, United Kingdom |

2008 | Centre for Quantum Photonics, H. H. Wills Physics Laboratory and Department of Electrical and Electronic Engineering, University of Bristol, Bristol, United Kingdom |

2007 | Centre for Quantum Computer Technology, University of Queensland, Brisbane QLD 4072, Australia Department of Electrical and Electronic Engineering, University of Bristol, Merchant Venturers Building, Woodland Road, Bristol BS8 1UB, UK. H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, United Kingdom |

2006 | Department of Physics, University of Queensland, Brisbane, Queensland 4072, Australia |

2005 | School of Physical Sciences, The University of Queensland, Brisbane 4072, Australia |

2004 | Centre for Quantum Computer Technology, School of Physics, University of New South Wales, Sydney 2052, Australia |

2003 | Center for Quantum Computer Technology and School of Physical Sciences, University of Queensland, QLD 4072, Brisbane, Australia |

2002 | Centre for Quantum Computer Technology, University of New South Wales, Sydney 2052, Australia |

2000 | Centre for Quantum Computer Technology, University of New South Wales, 2052, Sydney, Australia |

1999 | National Pulsed Magnet Laboratory, School of Physics, University of New South Wales, Sydney 2052, Australia |

1998 | National Pulsed Magnet Laboratory and Semi-Conductor Nanofabrication Facility School of Physics, University of New South Wales, 2052 Australia |

Concept | World rank |
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computation highlights | #1 |

ringresonator photonpair sources | #1 |

photonic qubits quantum | #1 |

basis arbitrary strength | #1 |

calculating unknown | #1 |

enforces physicality data | #1 |

quantum interference photons | #1 |

classical computers applications | #1 |

components quantum | #1 |

devices mmi | #1 |

∣0⟩±∣1⟩ fidelity | #1 |

entanglement additional unitaries | #1 |

sip heterodimers | #1 |

silicon waveguide circuits | #1 |

quantitative formulation concept | #1 |

key enabling principles | #1 |

paths heisenberg limit | #1 |

practical advantages technology | #1 |

chip state | #1 |

emerging scenarios satellite | #1 |

integrated state analyzers | #1 |

technology polarizers | #1 |

quantum algorithms steps | #1 |

quantum mechanics hadamards | #1 |

sensitivity nphoton interferometers | #1 |

fast factoring | #1 |

existing technology implementations | #1 |

phase estimation strategies | #1 |

chip client | #1 |

qnd scheme measurement | #1 |

car quantum technologies | #1 |

standard qkd protocols | #1 |

yba2cu3o7δ 150 | #1 |

versatile simulation platform | #1 |

mmi sion | #1 |

multiple integrated devices | #1 |

entangled nqubit states | #1 |

order loss kerr | #1 |

quantum walks fosters | #1 |

efficient quantum walk | #1 |

entanglement nonspecialists | #1 |

setup switch | #1 |

shor quantum | #1 |

949±13 | #1 |

fock state filter | #1 |

15 machzehnder interferometers | #1 |

technically demanding tasks | #1 |

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**Prominent publications by Jeremy L O’Brien**

Integrated photonics has enabled much progress toward quantum technologies. Many applications, e.g., quantum communication, sensing, and distributed cloud quantum computing, require coherent photonic interconnection between separate on-chip subsystems. Large-scale quantum computing architectures and systems may ultimately require quantum interconnects to enable scaling beyond the limits of a single wafer, and toward multi-chip systems. However, coherently connecting separate chips ...

Known for | Quantum Photonic | Entangled States | Path Polarization | Entanglement DistributionGrating Coupler |

Integrated quantum photonics is a promising approach for future practical and large-scale quantum information processing technologies, with the prospect of on-chip generation, manipulation and measurement of complex quantum states of light. The gallium arsenide (GaAs) material system is a promising technology platform, and has already successfully demonstrated key components including waveguide integrated single-photon sources and integrated single-photon detectors. However, quantum ...

Known for | Quantum Photonic | Gallium Arsenide | Single Photon | Circuits IntegratedTechnology Platform |

By weakly measuring the polarization of a photon between two strong polarization measurements, we experimentally investigate the correlation between the appearance of anomalous values in quantum **weak measurements** and the violation of realism and nonintrusiveness of measurements. A quantitative formulation of the latter concept is expressed in terms of a Leggett-Garg inequality for the outcomes of subsequent measurements of an individual quantum system. We experimentally violate the ...

Known for | Garg Inequality | Weak Measurements | Violation Leggett | Anomalous ValuesQuantum Theory |

We propose a quantum nondemolition method—a giant optical Faraday rotation near the **resonant regime** to measure a single-electron spin in a **quantum dot** inside a microcavity where a **negatively charged exciton** strongly couples to the cavity mode. Left-circularly and right-circularly polarized lights reflected from the cavity obtain different **phase shifts** due to cavity quantum electrodynamics and the optical spin selection rule. This yields giant and tunable Faraday rotation that can be ...

Known for | Single Photon | Faraday Rotation | Giant Optical | Electron SpinQuantum Dot |

Integrated quantum photonic applications, providing physically guaranteed communications security, subshot-noise measurement, and tremendous computational power, are nearly within technological reach. Silicon as a technology platform has proven formidable in establishing the micro-electronics revolution, and it might do so again in the **quantum technology** revolution. Silicon has taken photonics by storm, with its promise of scalable manufacture, integration, and compatibility with CMOS ...

Known for | Silicon Quantum Photonics | Quantum Technology | Photonic Systems | Compatibility CmosComponents Constitute |

Quantum technologies based on photons will likely require an **integrated optics** architecture for improved performance, miniaturization, and scalability. We demonstrate high-fidelity silica-on-silicon integrated optical realizations of key **quantum photonic** circuits, including two-photon **quantum interference** with a visibility of 94.8 +/- 0.5%; a controlled-NOT gate with an average logical basis fidelity of 94.3 +/- 0.2%; and a path-entangled state of two photons with fidelity of >92%. These ...

Known for | Quantum Circuits | Photons Fidelity | Silicon Chip | Fundamental ScienceCommunication Metrology |

A goal of the emerging field of quantum control is to develop methods for quantum technologies to function robustly in the presence of noise. Central issues are the fundamental limitations on the available information about **quantum systems** and the disturbance they suffer in the process of measurement. In the context of a simple quantum control scenario-the stabilization of **nonorthogonal states** of a qubit against dephasing-we experimentally explore the use of **weak measurements** in feedback ...

Known for | Weak Measurements | Quantum Systems | Feedback Control | Nonorthogonal StatesPresence Noise |

Large-scale integrated quantum photonic technologies1,2 will require on-chip integration of identical **photon sources** with reconfigurable waveguide circuits. Relatively complex quantum circuits have been demonstrated already1,2,3,4,5,6,7, but few studies acknowledge the pressing need to integrate photon sources and **waveguide circuits** together on-chip8,9. A **key step** towards such large-scale **quantum technologies** is the integration of just two individual photon sources within a waveguide ...

Known for | Chip Quantum | Photon Sources | Waveguide Circuits | Key StepScale Integrated |

Quantum computational algorithms exploit quantum mechanics to solve problems exponentially faster than the best classical algorithms1,2,3. Shor's quantum algorithm4 for fast number factoring is a key example and the **prime motivator** in the **international effort** to realize a quantum computer5. However, due to the substantial resource requirement, to date there have been only four small-scale demonstrations6,7,8,9. Here, we address this **resource demand** and demonstrate a **scalable version** of ...

Known for | Experimental Realization | Quantum Factoring | Shors Algorithm | Single QubitPrevious Demonstrations |

A key step in the use of diamond nitrogen vacancy (NV) centers for quantum **computational tasks** is a **single shot** quantum non-demolition measurement of the electronic spin state. Here, we propose a high fidelity measurement of the **ground state** spin of a single NV center, using the effects of **cavity quantum** electrodynamics. The scheme we propose is based in the one-dimensional atom or Purcell regime, removing the need for high Q cavities that are challenging to fabricate. The ground state ...

Known for | Nv Center | Spin Measurement | Ground State | Cavity QuantumDiamond Nitrogen Vacancy |

Absorption spectroscopy is routinely used to characterise chemical and biological samples. For the state-of-the-art in laser absorption spectroscopy, precision is theoretically limited by shot-noise due to the fundamental Poisson-distribution of photon number in laser radiation. In practice, the shot-noise limit can only be achieved when all other sources of noise are eliminated. Here, we use wavelength-correlated and tuneable photon pairs to demonstrate how **absorption spectroscopy** can ...

Known for | Absorption Spectroscopy | Ultimate Quantum Limit | Single Photons | Laser RadiationShot Noise |

The promise of tremendous computational power, coupled with the development of robust error-correcting schemes1, has fuelled extensive efforts2 to build a quantum computer. The requirements for realizing such a device are confounding: scalable quantum bits (two-level quantum systems, or qubits) that can be well isolated from the environment, but also initialized, measured and made to undergo controllable interactions to implement a universal set of quantum logic gates3. The usual set ...

Known for | Optical Quantum | Cnot Gate | Control Qubit | Bell StatesExperimental Demonstration |

The quest to build a quantum computer has been inspired by the recognition of the formidable computational power such a device could offer. In particular silicon-based proposals, using the nuclear or **electron spin** of dopants as qubits, are attractive due to the **long spin relaxation** times involved, their scalability, and the ease of integration with existing silicon technology. Fabrication of such devices, however, requires **atomic scale** manipulation — an immense technological challenge. ...

Known for | Quantum Computer | Phosphorus Atoms | Silicon Surface | Fabrication DevicesLong Spin Relaxation |

### Quantum interference and manipulation of entanglement in silicon wire waveguide quantum circuits

[ PUBLICATION ]

Integrated quantum photonic waveguide circuits are a **promising approach** to realizing future photonic quantum technologies. Here, we present an integrated photonic quantum **technology platform** utilizing the silicon-on-insulator material system, where **quantum interference** and the manipulation of quantum states of light are demonstrated in components orders of magnitude smaller than previous implementations. Two-photon quantum interference is presented in a multi-mode interference coupler, ...

Known for | Quantum Interference | Promising Approach | Manipulation Entanglement | Silicon PhotonicWaveguide Circuits |

Quantum phase estimation is a fundamental subroutine in many quantum algorithms, including Shor's factorization algorithm and quantum simulation. However, so far results have cast doubt on its practicability for near-term, nonfault tolerant, quantum devices. Here we report experimental results demonstrating that this intuition need not be true. We implement a recently proposed adaptive **Bayesian approach** to **quantum phase estimation** and use it to simulate molecular energies on a silicon ...

Known for | Quantum Phase Estimation | Silicon Photonic Chip | Bayesian Approach | Robustness NoisePhotonic Device |

## Key People For **Quantum Interference**

**Select a search phrase**quantum interference , quantum interference effects , quantum interference device , quantum interference devices , quantum interferences