Superfluid Optomechanics
From left to right: Henry Ginn (RA), Zara Graham-Jones (RA), Sean Hibbitt (PhD), Matthew Kenworthy (PhD), Grégoire Ithier (Co-I), Xavier Rojas (PI)
In the rapidly progressing field of quantum optomechanics, our group is at the forefront of Superfluid Optomechanics. We delve into the innovative use of superfluid helium, a macroscopic quantum system, to significantly limit acoustic losses — a pivotal step for the advancement of quantum optomechanical systems.
Our team continuously works to enhance control over phonon propagation and confinement within quantum nanofluidic systems. This focus helps in maintaining the intrinsic properties of superfluid helium while minimizing external limitations like heating or radiation losses.
Key Areas of Our Activity Include:
- Quantum Exploration:
Advancing the field of superfluid optomechanics into the deep quantum regime to explore fundamental physics questions and pave the way for developing cutting-edge quantum technologies. - Analogue Gravity Experiments:
Realizing quantum simulators for analogue gravity experiments by manipulating and detecting superfluid helium surface waves using microwave fields. - Hybrid Superfluid Optomechanics:
Investigating novel architectures to study compliant mechanical structures (e.g. NEMS), enhancing their coupling to superfluid helium for sensing capabilities, for instance, in dark matter and gravitational wave detection. - Microwave Optomechanics Applications:
Developing innovative systems for ambient-temperature microwave optomechanics applications in sensing and signal processing. - Topological Superfluidity:
Harnessing quantum nanofluidics and the sensitivity of superfluid optomechanics to address complex questions in topological superfluidity.
Quantum Exploration
In our quest for quantum exploration, we aim to harness the exotic properties of superfluid helium-4. This quantum liquid stands out as an ideal and flexible mechanical element for quantum optomechanics. By merging the unique properties of this quantum liquid, recent advances in nanofluidics, and high finesse superconducting microwave cavities, we are undertaking a versatile programme of quantum optomechanics experiments. State-of-the-art nanofabrication techniques enable us to make precisely defined nanofluidic geometries to confined superfluid helium [1], generate phononic nanostructures [2], and significantly enhance the performances of superfluid optomechanical devices. With these novel systems we aim to push the field of quantum optomechanics forward, and drive the development of innovative quantum science technology applications.
[1] Ultralow-Dissipation Superfluid Micromechanical Resonator
Analogue Gravity Experiments
As a part of the UK’s Quantum Technologies for Fundamental Physics initiative, our research explores the interplay between general relativity and quantum fields in extreme environments. The inaccessible nature of such conditions limits traditional theoretical and experimental approaches. Our objective within the qSimFP initiative is to use analogue quantum simulators to overcome these limitations, offering a unique pathway to study phenomena analogue to black hole processes in a controlled laboratory setting. We focus on developing innovative superfluid-based quantum optomechanical systems [1]. These simulators allow for an exploration of the dynamics of rotating black holes from macro to nanoscales. Building upon our developments in superfluid optomechanics, we are working towards new techniques for the manipulation and detection of superfluid waves using microwave fields. This research promises insights into fundamental physics and quantum technologies.
Hybrid Superfluid Optomechanics
Our exploration is centred on the potential of superfluid helium as a material for building mechanical resonators with minimal energy dissipation. This endeavour enables the realization of long-live mechanical states. By harnessing cutting-edge advancements in nanofabrication, we engineer precise structures that confine superfluid helium in nanoscale volumes, giving rise to high-frequency superfluid acoustic resonances. Employing superconducting microwave cavities coupled to compliant high-quality membranes, we achieve exceptional sensitivity in detecting the amplitude of superfluid acoustic waves. This research enables measurements beyond existing limits and is poised to make contributions to diverse fields such as dark matter and gravitational wave detection.
Topological Superfluidity
Our innovative approach using a nanofluidic cavity optomechanical system opens novel avenues for studying quantum fluid properties with unprecedented sensitivity. Specifically, our methodology is well suited for the study of superfluid 3He, serving as a highly sensitive instrument for investigating topological superfluidity and surface states excitations, including the exploration of Majorana fermions [1]. Our proposed non-invasive techniques seamlessly integrate with diverse on-chip architectures, enhancing the versatility of their application. This integration of optomechanics with micro/nanofluidics holds the promise of pioneering new technologies in the field of topological superfluidity.
[1] Fragility of surface states in topological superfluid 3He
Join us in pushing the boundaries of quantum optomechanical systems,
exploring new realms of physics, and pioneering the development of transformative quantum technologies.
Contact: Dr Xavier Rojas (xavier.rojas@rhul.ac.uk)