A5050840657- Quantum Information and Cryptography
- Quantum optics and atomic interactions
- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Subatomic Physics Research
- Dark Matter and Cosmic Phenomena
- Space Exploration and Technology
- Geophysics and Sensor Technology
- Photonic and Optical Devices
- Spaceflight effects on biology
- Neural Networks and Reservoir Computing
- Magnetic Field Sensors Techniques
Australian National University
2018-2024
Quantum (Australia)
2018-2024
Centre for Quantum Computation and Communication Technology
2018-2024
Machine learning based on artificial neural networks has emerged as an efficient means to develop empirical models of complex systems. Cold atomic ensembles have become commonplace in laboratories around the world, however, many-body interactions give rise dynamics that preclude precise analytic optimisation cooling and trapping process. Here, we implement a deep network optimise magneto-optic neutral ensembles. The solution identified by machine is radically different smoothly varying...
Abstract Ultralight bosons such as axion-like particles are viable candidates for dark matter. They can form stable, macroscopic field configurations in the of topological defects that could concentrate matter density into many distinct, compact spatial regions small compared with Galaxy but much larger than Earth. Here we report results search transient signals from domain walls by using global network optical magnetometers exotic (GNOME) physics searches. We data, consisting correlated...
Abstract Alkali-noble-gas comagnetometers have become an essential tool for tests of fundamental physics and offer a compact platform precision gyroscopy. They are, however, limited by technical noise at low frequencies, commonly due to their suppression magnetic noise. Here we investigate new method co-magnetometry between single noble gas alkali species. While similar well-known devices using self-compensation, our scheme introduces pulses that controllably perturb the pulsed optical...
Efficient quantum memories will be an essential building block of large-scale networked systems and provide a link between flying photonic qubits atomic or quasi-atomic local processors. Memory efficiencies above 50% are required to operating the no-cloning limit. High efficiency operation necessitates tailored photon source memory pairs with matched bandwidths. In this paper, we explore combination ultralow spectral bandwidth single photons from cavity-enhanced spontaneous parametric...
The efficiency of an ensemble-based optical quantum memory depends critically on the strength atom-light coupling. An cavity is effective method to enhance coupling strength, with drawback that cavities can be difficult integrate into a setup. In this work we show coherent enhancement via interference effect. light absorbed atomic ensemble split and used drive atoms from opposite ends ensemble. We compare theoretically cavity-enhanced scheme present experimental results for our in cold...
Abstract Results are reported from the first full-scale search for transient signals exotic fields of astrophysical origin using data a newly constructed Earth-scale detector: Global Network Optical Magnetometers Exotic physics searches (GNOME). Data collected by GNOME consist correlated measurements optical atomic magnetometers located in laboratories all over world. searched patterns propagating through network consistent with composed ultralight bosons such as axion-like particles (ALPs)....
A number of techniques exist to use an ensemble atoms as a quantum memory for light.Many these propose backward retrieval way improve the storage and recall efficiency.We report on demonstration off-resonant Raman that uses achieve efficiency 65 ± 6% at time one pulse duration.The has characteristic decay 60 µs, corresponding delay-bandwidth product 160.
Alkali-noble-gas comagnetometers have become an essential tool for tests of fundamental physics and offer a compact platform precision gyroscopy. They are, however, limited by technical noise at low frequencies, commonly due to their suppression magnetic noise. Here we investigate new method co-magnetometry between single noble gas alkali species. While similar well-known devices using self-compensation, our scheme introduces pulses that controllably perturb the pulsed optical pumping...
Strong nonlinear interactions between single photons have important applications in optical quantum information processing. Demonstrations of these cold atomic ensembles largely been limited to exploiting slow light generated using electromagnetically induced transparency (EIT). However, EIT implementations achievable phase shifts due spontaneous emission. Here, we demonstrate and characterize a scheme free from limitations gradient echo memory with inferred photon $0.07\pm0.02$...
Quantum information systems demand methods for the storage and manipulation of qubits. For optical qubits, atomic ensembles provide a potential platform such operations. In this work, we demonstrate stopped light quantum memory with efficiency up to 87%. We also visualise stationary light, which could potentially enhance weak nonlinearities. At heart our experiments is laser-cooled ensemble, has recently been optimised help machine learning system that uses an artificial neural network.
Gradient echo memory is the most efficient quantum protocol to date. Recent additions of machine learning and compatible single photons can raise its performance possibility using it as a gate.
Quantum repeaters are foundational to establishing the long distance quantum communication channels necessary create a global network [1]. A memory capable of storing optical states is an integral component repeater.
Efficient quantum memories will be an essential building block of large scale networked systems and provide a link between flying photonic qubits atomic or quasi-atomic local processors. To path to scalability avoidance bulky, difficult maintain such as high vacuum low temperature cryogenics is imperative. Memory efficiencies above 50% are required operating the no-cloning limit. Such have only been achieved in with photon sources tailored memory bandwidth. In this paper we explore...