A5060884704- Quantum Mechanics and Applications
- Quantum Information and Cryptography
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum Electrodynamics and Casimir Effect
- Mechanical and Optical Resonators
- Pulsars and Gravitational Waves Research
- Geophysics and Sensor Technology
- Quantum, superfluid, helium dynamics
- Cosmology and Gravitation Theories
- Atomic and Subatomic Physics Research
- Advanced Frequency and Time Standards
- Quantum Computing Algorithms and Architecture
- Advanced Thermodynamics and Statistical Mechanics
- Relativity and Gravitational Theory
- Orbital Angular Momentum in Optics
- Dark Matter and Cosmic Phenomena
- Strong Light-Matter Interactions
- Experimental and Theoretical Physics Studies
- Black Holes and Theoretical Physics
- Noncommutative and Quantum Gravity Theories
- Advanced Fiber Optic Sensors
- Quantum optics and atomic interactions
- Quantum and Classical Electrodynamics
- Spectroscopy and Quantum Chemical Studies
- Seismic Waves and Analysis
University of Southampton
2021-2025
University of Oxford
2023-2025
University of Nottingham
2014-2024
University of Vienna
2015-2020
Austrian Academy of Sciences
2018-2020
Humboldt-Universität zu Berlin
2019
Abstract We propose in this White Paper a concept for space experiment using cold atoms to search ultra-light dark matter, and detect gravitational waves the frequency range between most sensitive ranges of LISA terrestrial LIGO/Virgo/KAGRA/INDIGO experiments. This interdisciplinary experiment, called Atomic Experiment Dark Matter Gravity Exploration (AEDGE), will also complement other planned searches exploit synergies with wave detectors. give examples extended sensitivity matter offered...
We study the effects of relativistic motion on quantum teleportation and propose a realizable experiment where our results can be tested. compute bounds optimal fidelity when one observers undergoes nonuniform for finite time. The upper bound to is degraded due observer's motion. However, we discuss how this degradation corrected. These are observable experimental parameters that within reach cutting-edge superconducting technology.
Gaussian states are of increasing interest in the estimation physical parameters because they easy to prepare and manipulate experiments. In this article, we derive formulae for optimal using two- multi-mode states. As an application our result, probe parameter characterizing a one-mode squeezing channel.
We investigate the consequences of space-time being curved on space-based quantum communication protocols. analyze tasks that require either exchange single photons in a certain entanglement distribution protocol or beams light continuous-variable key scheme. find gravity affects propagation photons, therefore adding additional noise to channel for transmission information. The effects could be measured with current technology.
In quantum metrology properties such as squeezing and entanglement are exploited in the design of a new generation clocks, sensors other measurement devices that can outperform their classical counterparts. Applications great technological relevance lie precise parameters which play central role relativity, proper accelerations, relative distances, time gravitational field strengths. this paper we generalise recently introduced techniques to estimate physical quantities within theory flat...
Despite almost a century's worth of study, it is still unclear how general relativity (GR) and quantum theory (QT) should be unified into consistent theory. The conventional approach to retain the foundational principles QT, such as superposition principle, modify GR. This referred `quantizing gravity', resulting in `quantum gravity'. opposite `gravitizing QT' where we attempt keep GR, equivalence consider this leads modifications QT. What are most lacking understanding which route take, if...
Abstract We propose an experiment based on a Bose–Einstein condensate interferometer for strongly constraining fifth-force models. Additional scalar fields from modified gravity or higher dimensional theories may account dark energy and the accelerating expansion of Universe. These have led to proposed screening mechanisms fit within tight experimental bounds searches. show that our would greatly improve existing constraints these models by many orders magnitude.
The techniques employed to solve the interaction of a detector and quantum field commonly require perturbative methods.We introduce mathematical time evolution an arbitrary number detectors interacting with moving in space-time while using non-perturbative methods.Our apply harmonic oscillator can be generalised treat modelled by fields.Since Hamiltonian we is quadratic creation annihilation operators, are able draw from continuous variable optics.
We introduce a primary thermometer which measures the temperature of Bose-Einstein Condensate in sub-nK regime. show, using quantum Fisher information, that precision our technique improves state-of-the-art thermometry The condensate is mapped onto phase an atomic dot interacts with system for short times. show highest achieved when dynamical rather than geometric and it detected through Ramsey interferometry. Standard techniques to determine involve indirect estimation mean particle...
We construct a practical method for finding optimal Gaussian probe states the estimation of parameters encoded by unitary channels. This can be used all states, rather than focusing on performance specific as shown in previous studies. As an example, we apply this to find probes channel that combines phase-change and squeezing channels, generalized two-mode mode-mixing The enables comprehensive study temperature effects parameter estimation. It has been precision using single-mode enhanced...
We propose a quantum experiment to measure with high precision the Schwarzschild spacetime parameters of Earth. The scheme can also be applied distances by taking into account curvature Earth's spacetime. As wave packet (entangled) light is sent from Earth satellite it redshifted and deformed due Measurements after propagation enable estimation parameters. compare our results state art, which involves classical measurement methods, discuss what developments are required in space-based...
We address the issue of precisely estimating small parameters encoded in a general linear transformation modes bosonic quantum field. Such Bogoliubov transformations frequently appear context optics. provide set instructions for computing Fisher information arbitrary pure initial states. show that maximally achievable precision estimation is inversely proportional to squared average particle number and such Heisenberg scaling requires nonclassical but not necessarily entangled Our method...
We present a framework for relativistic quantum metrology that is useful both Earth-based and space-based technologies. Quantum has been so far successfully applied to design precision instruments such as clocks sensors which outperform classical devices by exploiting properties. There are advanced plans implement these other technologies in space, instance Space-QUEST Space Optical Clock projects intend communications at regimes where relativity starts kick in. However, typical setups do...
Models of quantum systems on curved space-times lack sufficient experimental verification. Some speculative theories suggest that properties, such as entanglement, may exhibit entirely different behavior to purely classical systems. By measuring this effect or thereof, we can test the hypotheses behind several models. For instance, predicted by Ralph and coworkers [T C Ralph, G J Milburn, T Downes, Phys. Rev. A, 79(2):22121, 2009, Pienaar, New Journal Physics, 16(8):85008, 2014], a bipartite...
Concerted efforts are underway to establish an infrastructure for a global quantum internet realise spectrum of technologies. This will enable more precise sensors, secure communications, and faster data processing. Quantum communications front-runner with networks already implemented in several metropolitan areas. A number recent proposals have modelled the use space segments overcome range limitations purely terrestrial networks. Rapid progress design devices enabled their deployment...
Einstein's general theory of relativity is based on the principle equivalence - in essence, dating back to Galileo which asserts that, locally, effect a gravitational field equivalent that an accelerating reference frame, so local eliminated freely falling frame. enables this extend global description relativistic space-time, at expense allowing space-time become curved, realising consistent frame-independent nature classical level. has been confirmed great accuracy for astrophysical bodies....
We propose an experiment to test the effects of gravity and acceleration on quantum entanglement in space-based setups. show that between excitations two Bose–Einstein condensates is degraded after one them undergoes a change gravitational field strength. This prediction can be tested if are initially entangled separate satellites while being same orbit then moves different orbit. effect observable typical orbital manoeuvre nanosatellites like CanX4 CanX5.
We show that the relativistic motion of a quantum system can be used to generate gates. The nonuniform acceleration cavity is well-known two-mode gates in continuous variables. Observable amounts entanglement between modes are produced through resonances appear by repeating periodically any trajectory.
Abstract The unification of the theory relativity and quantum mechanics is a long-standing challenge in contemporary physics. Experimental techniques optics have only recently reached maturity required for investigation systems under influence non-inertial motion, such as being held at rest gravitational fields, or subjected to uniform accelerations. Here, we report on experiments which genuine state an entangled photon pair exposed series different We measure entanglement witness g-values...
We study how quantum systems that propagate in the spacetime of a rotating planet are affected by curved background. Spacetime curvature affects wavepackets photons propagating from Earth to satellite, and changes wavepacket encode parameters spacetime. This allows us evaluate quantitatively communications background achieve precise measurements Earth's Schwarzschild radius equatorial angular velocity. then provide comparison with state art parameter estimation obtained through classical...
The generation and distribution of entanglement is a central topic in quantum information science, enabling important applications communication computing. This has created great interest creating ``flying'' entangled states. authors present parametric cavity that generates multimode states microwave photons with programmable structure. advance will facilitate progress range fields, including cluster states, error-correctable logical qubits for communication, the simulation relativistic...
We analyze the generation of quantum discord by means dynamical Casimir effect in superconducting wave guides modulated interferometric devices. show that for realistic experimental parameters, conditions existence are less demanding than previously considered entanglement or nonclassicality. These results could facilitate confirmation nature radiation. Moreover, states with nonzero and zero generated a useful resource cryptography.
We show how to use relativistic motion and local phase shifts generate continuous variable Gaussian cluster states within cavity modes. Our results can be demonstrated experimentally using superconducting circuits where tuneable boundary conditions correspond mirrors moving with velocities close the speed of light. In particular, we propose generation a quadripartite square state as first example that readily implemented in laboratory. Since are universal resources for one-way quantum...
At the beginning of previous century, Newtonian mechanics was advanced by two new revolutionary theories, Quantum Mechanics (QM) and General Relativity (GR). Both theories have transformed our view physical phenomena, with QM accurately predicting results experiments taking place at small length scales, GR correctly describing observations larger scales. However, despite impressive predictive power each theory in their respective regimes, unification still remains unresolved. Theories...