Warwick P. Bowen

University of Queensland

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Glen I. Harris

University of Queensland

Joachim Knittel

University of Queensland

Ping Koy Lam

Centre for Quantum Computation and Communication Technology

Hans‐A. Bachor

Australian National University

Christopher G. Baker

ARC Centre of Excellence for Engineered Quantum Systems

Stefan Forstner

University of Queensland

Michael A. Taylor

University of Queensland

Nicolas Treps

Laboratoire Kastler Brossel

Lars S. Madsen

Xanadu Quantum Technologies (Canada)

Halina Rubinsztein‐Dunlop

University of Queensland

Cooperative Institutions

University of Queensland

115

ARC Centre of Excellence for Engineered Quantum Systems

Quantum (Australia)

Australian Research Council

Australian National University

Centre National de la Recherche Scientifique

Centre for Quantum Computation and Communication Technology

California Institute of Technology

Technical University of Denmark

Sorbonne Université

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Nondestructive Profilometry of Optical Nanofibers

Nano Letters (2016)

Lars S. Madsen Christopher G. Baker Halina Rubinsztein‐Dunlop Warwick P. Bowen

Single-mode optical nanofibers are a central component of a broad range of applications and emerging technologies. Their fabrication has been extensively studied over the past decade, but imaging of the final submicrometer products has been restricted to destructive or low-precision techniques. Here, we demonstrate an optical scattering-based scanning method that uses a probe nanofiber to locally scatter the evanescent field of a sample nanofibre. The method does not damage the sample nanofiber and is easily implemented by only using the same equipment as in a standard fiber-puller setup. We demonstrate the subnanometer radial resolution at video rates (0.7 nm in 10 ms) on single mode nanofibers, allowing for a complete high-precision profile to be obtained within minutes of fabrication. The method thus enables nondestructive, fast, and precise characterization of optical nanofibers, with applications ranging from optical sensors and cold atom traps to nonlinear optics.

Characterization

10.1021/acs.nanolett.6b02460

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Citations (17)

Quantum correlations overcome the photodamage limits of light microscopy

arXiv (Cornell University) (2020)

Catxere A. Casacio Lars S. Madsen Alex Terrasson Muhammad Waleed Kai Barnscheidt

State-of-the-art microscopes use intense lasers that can severely disturb biological processes, function and viability. This introduces hard limits on performance that only quantum photon correlations can overcome. Here we demonstrate this absolute quantum advantage, achieving signal-to-noise beyond the photodamage-free capacity of conventional microscopy. We achieve this in a coherent Raman microscope, which we use to image molecular bonds within a cell with both quantum-enhanced contrast and sub-wavelength resolution. This allows the observation of nanoscale biological structures that would otherwise not be resolved. Coherent Raman microscopes allow highly selective biomolecular finger-printing in unlabelled specimens, but photodamage is a major roadblock for many applications. By showing that this roadblock can be overcome, our work provides a path towards order-of-magnitude improvements in both sensitivity and imaging speed.

Quantum imaging

SIGNAL (programming language)

10.48550/arxiv.2004.00178

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The Einstein-Podolsky-Rosen paradox - a fundamental challenge and a tool for quantum engineering

arXiv (Cornell University) (2008)

M. D. Reid P. D. Drummond Eric G. Cavalcanti Warwick P. Bowen Ping Koy Lam

This Colloquium examines the field of the EPR Gedankenexperiment, from the original paper of Einstein, Podolsky and Rosen, through to modern theoretical proposals of how to realize both the continuous-variable and discrete versions of the EPR paradox. We analyze the relationship with entanglement and Bell's theorem, and summarize the progress to date towards experimental confirmation of the EPR paradox, with a detailed treatment of the continuous-variable paradox in laser-based experiments. Practical techniques covered include continuous-wave parametric amplifier and optical fibre quantum soliton experiments. We discuss current proposals for extending EPR experiments to massive-particle systems, including spin-squeezing, atomic position entangle- ment, and quadrature entanglement in ultra-cold atoms. Finally, we examine applications of this technology to quantum key distribution, quantum teleportation and entanglement-swapping.

EPR paradox

Quantum key distribution

Continuous variable

Quantum teleportation

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Optomechanical Dark Matter Direct Detection

arXiv (Cornell University) (2023)

Christopher G. Baker Warwick P. Bowen Peter Cox Matthew J. Dolan Maxim Goryachev

We propose the Optomechanical Dark-matter INstrument (ODIN), based on a new method for the direct detection of low-mass dark matter. We consider dark matter interacting with superfluid helium in an optomechanical cavity. Using an effective field theory, we calculate the rate at which dark matter scatters off phonons in a highly populated, driven acoustic mode of the cavity. This scattering process deposits a phonon into a second acoustic mode in its ground state. The deposited phonon ($\mu$eV range) is then converted to a photon (eV range) via an optomechanical interaction with a pump laser. This photon can be efficiently detected, providing a means to sensitively probe keV scale dark matter. We provide realistic estimates of the backgrounds and discuss the technical challenges associated with such an experiment. We calculate projected limits on dark matter-nucleon interactions for dark matter masses ranging from 0.5 to 300 keV and estimate that a future device could probe cross-sections as low as $\mathcal{O}(10^{-32})$ cm$^2$.

Dark state

Light dark matter

Dark photon

10.48550/arxiv.2306.09726

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Citations (4)

Laser control and readout of superfluid flow

Bulletin of the American Physical Society (2018)

Stefan Forstner Yauhen Sachkou Xin He Gian-Marco Schnueringer A. Sawadsky

Flow Control

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Measurement-based preparation of non-Markovian and multimode mechanical states

arXiv (Cornell University) (2021)

Chao Meng George A. Brawley Soroush Khademi Elizabeth M. Bridge James S. Bennett

Nanomechanical resonators are a key tool for future quantum technologies such as quantum force sensors and interfaces, and for studies of macroscopic quantum physics. The ability to prepare room temperature non-classical states is a major outstanding challenge. Here, we explore the use of measurement-based state conditioning to achieve this. We demonstrate conditional cooling of a nanomechanical resonator that has non-Markovian decoherence, and show theoretically that the non-Markovianity makes quantum squeezing significantly easier to achieve. We further show that collective measurement of multiple resonator modes improves the quality of state preparation. This allows us to achieve collective thermomechanical squeezing, in experiments that go beyond the validity of the rotating-wave approximation. Our modelling shows that non-Markovianity and multimode conditioning can both enable room temperature quantum squeezing with existing technology. Together, our results pave the way towards realising room temperature quantum nanomechanical devices and towards their application in quantum technology and fundamental science.

10.48550/arxiv.2109.12796

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Directional emission in an on-chip acoustic waveguide

arXiv (Cornell University) (2023)

Timothy M. F. Hirsch Nicolas P. Mauranyapin Erick Romero Tina Jin Glen I. Harris

Integrated acoustic circuits leverage guided acoustic waves for applications ranging from radio-frequency filters to quantum state transfer, biochemical sensing and nanomechanical computing. In many applications it is desirable to have a method for unidirectional acoustic wave emission. In this work we demonstrate directional emission in an integrated single-mode, on-chip membrane waveguide, demonstrating over 99.9% directional suppression and reconfigurable directionality. This avoids both loss and unwanted crosstalk, allowing the creation of more complex and compact phononic circuits.

Ranging

Crosstalk

Waveguide

Acoustic Emission

Leverage (statistics)

10.48550/arxiv.2310.09308

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Quantum light microscopy

arXiv (Cornell University) (2023)

Warwick P. Bowen Helen M. Chrzanowski Dan Oron Sven Ramelow Dmitry Tabakaev

Much of our progress in understanding microscale biology has been powered by advances in microscopy. For instance, super-resolution microscopes allow the observation of biological structures at near-atomic-scale resolution, while multi-photon microscopes allow imaging deep into tissue. However, biological structures and dynamics still often remain out of reach of existing microscopes, with further advances in signal-to-noise, resolution and speed needed to access them. In many cases, the performance of microscopes is now limited by quantum effects -- such as noise due to the quantisation of light into photons or, for multi-photon microscopes, the low cross-section of multi-photon scattering. These limitations can be overcome by exploiting features of quantum mechanics such as entanglement. Quantum effects can also provide new ways to enhance the performance of microscopes, such as new super-resolution techniques and new techniques to image at difficult to reach wavelengths. This review provides an overview of these various ways in which quantum techniques can improve microscopy, including recent experimental progress. It seeks to provide a realistic picture of what is possible, and what the constraints and opportunities are.

Microscale chemistry

Quantum imaging

10.48550/arxiv.2311.05807

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Free spectral range electrical tuning of a high quality on-chip microcavity

Optics Express (2018)

Christiaan Bekker Christopher G. Baker Rachpon Kalra Han‐Hao Cheng Bei‐Bei Li

Reconfigurable photonic circuits have applications ranging from next-generation computer architectures to quantum networks, coherent radar and optical metamaterials.However, complete reconfigurability is only currently practical on millimetre-scale device footprints.Here, we overcome this barrier by developing an on-chip high quality microcavity with resonances that can be electrically tuned across a full free spectral range (FSR).FSR tuning allows resonance with any source or emitter, or between any number of networked microcavities.We achieve it by integrating nanoelectronic actuation with strong optomechanical interactions that create a highly strain-dependent effective refractive index.This allows low voltages and sub-nanowatt power consumption.We demonstrate a basic reconfigurable photonic network, bringing the microcavity into resonance with an arbitrary mode of a microtoroidal optical cavity across a telecommunications fibre link.Our results have applications beyond photonic circuits, including widely tuneable integrated lasers, reconfigurable optical filters for telecommunications and astronomy, and on-chip sensor networks.

Free spectral range

10.1364/oe.26.033649

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Citations (25)

Issue Information

Quantum Engineering (2020)

Gui‐Lu Long Warwick P. Bowen Mark Byrd Dabing Li Gui-Xing Miao

Quantum Engineering is launched by Wiley as a world-leading journal in the engineering of quantum information.It bridges the gap between engineers and scientists, enabling them to take advantage of new quantum breakthroughs.Quantum Engineering strongly addresses the engineering community, in addition to the science community and the general audience.The topics covered by Quantum Engineering include quantum

10.1002/que2.15

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