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Generating multimode entangled microwaves with a superconducting parametric cavity (2018)
Journal Article
Chang, C. S., Simoen, M., Aumentado, J., Sabín, C., Forn-Díaz, P., Vadiraj, A., …Wilson, C. (2018). Generating multimode entangled microwaves with a superconducting parametric cavity. Physical Review Applied, 10(4), Article 044019. https://doi.org/10.1103/PhysRevApplied.10.044019

We demonstrate the generation of multimode entangled states of propagating microwaves. The entangled states are generated by our parametrically pumping a multimode superconducting cavity. By combining different pump frequencies, applied simultaneousl... Read More about Generating multimode entangled microwaves with a superconducting parametric cavity.

Dynamical response of Bose-Einstein condensates to oscillating gravitational fields (2018)
Journal Article
Rätsel, D., Howl, R., Lindkvist, J., & Fuentes, I. (2018). Dynamical response of Bose-Einstein condensates to oscillating gravitational fields. New Journal of Physics, 20(7), 073044. https://doi.org/10.1088/1367-2630/aad272

© 2018 The Author(s). Published by IOP Publishing Ltd on behalf of Deutsche Physikalische Gesellschaft. A description of the dynamical response of uniformly trapped Bose-Einstein condensates (BECs) to oscillating external gravitational fields is deve... Read More about Dynamical response of Bose-Einstein condensates to oscillating gravitational fields.

Analogue simulation of gravitational waves in a 3+1 -dimensional Bose-Einstein condensate (2018)
Journal Article
Hartley, D., Bravo, T., Rätzel, D., Howl, R., & Fuentes, I. (2018). Analogue simulation of gravitational waves in a 3+1 -dimensional Bose-Einstein condensate. Physical Review D, 98(2), Article 025011. https://doi.org/10.1103/PhysRevD.98.025011

The recent detections of gravitational waves (GWs) by the LIGO and Virgo collaborations have opened the field of GW astronomy, intensifying interest in GWs and other possible detectors sensitive in different frequency ranges. Although strong GW produ... Read More about Analogue simulation of gravitational waves in a 3+1 -dimensional Bose-Einstein condensate.

Frequency spectrum of an optical resonator in a curved spacetime (2018)
Journal Article
Rätzel, D., Schneiter, F., Braun, D., Bravo, T., Howl, R., Lock, M. P., & Fuentes, I. (2018). Frequency spectrum of an optical resonator in a curved spacetime. New Journal of Physics, 20(5), Article 053046. https://doi.org/10.1088/1367-2630/aac0ac

The effect of gravity and proper acceleration on the frequency spectrum of an optical resonator—both rigid or deformable—is considered in the framework of general relativity. The optical resonator is modeled either as a rod of matter connecting two m... Read More about Frequency spectrum of an optical resonator in a curved spacetime.

Gravity in the quantum lab (2017)
Journal Article
Howl, R., Hackermüller, L., Bruschi, D. E., & Fuentes, I. (2018). Gravity in the quantum lab. Advances in Physics, 3(1), Article 1383184. https://doi.org/10.1080/23746149.2017.1383184

At the beginning of the previous century, Newtonian mechanics was advanced by two new revolutionary theories, Quantum Mechanics (QM) and General Relativity (GR). Both theories have transformed our view of physical phenomena, with QM accurately predic... Read More about Gravity in the quantum lab.

Quantum decoherence of phonons in Bose–Einstein condensates (2017)
Journal Article
Howl, R., Sabín, C., Hackermüller, L., & Fuentes, I. (2017). Quantum decoherence of phonons in Bose–Einstein condensates. Journal of Physics B: Atomic, Molecular and Optical Physics, 51(1), https://doi.org/10.1088/1361-6455/aa9622

We apply modern techniques from quantum optics and quantum information science to Bose–Einstein condensates(BECs)in order to study, for the first time, the quantum decoherence of phonons of isolated BECs. In the last few years, major advances in the... Read More about Quantum decoherence of phonons in Bose–Einstein condensates.

Relativistic Quantum Clocks (2017)
Book Chapter
Lock, M. P. E., & Fuentes, I. (2017). Relativistic Quantum Clocks. In Time in Physics: Tutorials, Schools, and Workshops in the Mathematical Sciences, 51-68. Springer. doi:10.1007/978-3-319-68655-4_5

The conflict between quantum theory and the theory of relativity is exemplified in their treatment of time. We examine the ways in which their conceptions differ, and describe a semiclassical clock model combining elements of both theories. The resul... Read More about Relativistic Quantum Clocks.

Dynamical Casimir effect in curved spacetime (2017)
Journal Article
Lock, M. P., & Fuentes, I. (2017). Dynamical Casimir effect in curved spacetime. New Journal of Physics, 19, https://doi.org/10.1088/1367-2630/aa7651

A boundary undergoing relativistic motion can create particles from quantum vacuum fluctuations in a phenomenon known as the dynamical Casimir effect (DCE). We examine the creation of particles, and more generally the transformation of quantum field... Read More about Dynamical Casimir effect in curved spacetime.

Experimental test of photonic entanglement in accelerated reference frames (2017)
Journal Article
Fink, M., Rodriguez-Aramendia, A., Handsteiner, J., Ziarkash, A., Steinlechner, F., Scheidl, T., …Ursin, R. (2017). Experimental test of photonic entanglement in accelerated reference frames. Nature Communications, 8, 1-6. https://doi.org/10.1038/ncomms15304

The unification of the theory of relativity and quantum mechanics is a long-standing challenge in contemporary physics. Experimental techniques in quantum optics have only recently reached the maturity required for the investigation of quantum system... Read More about Experimental test of photonic entanglement in accelerated reference frames.

Quantum communications and quantum metrology in the spacetime of a rotating planet (2017)
Journal Article
Kohlrus, J., Bruschi, D. E., Louko, J., & Fuentes, I. (2017). Quantum communications and quantum metrology in the spacetime of a rotating planet. EPJ Quantum Technology, 4, Article 7. https://doi.org/10.1140/epjqt/s40507-017-0061-0

We study how quantum systems that propagate in the spacetime of a rotating planet are affected by the curved background. Spacetime curvature affects wavepackets of photons propagating from Earth to a satellite, and the changes in the wavepacket encod... Read More about Quantum communications and quantum metrology in the spacetime of a rotating planet.

Optimal probe states for the estimation of Gaussian unitary channels (2016)
Journal Article
Šafránek, D., & Fuentes, I. (2016). Optimal probe states for the estimation of Gaussian unitary channels. Physical Review A, 94(6), https://doi.org/10.1103/physreva.94.062313

We construct a practical method for finding optimal Gaussian probe states for the estimation of parameters encoded by Gaussian unitary channels. This method can be used for finding all optimal probe states, rather than focusing on the performance of... Read More about Optimal probe states for the estimation of Gaussian unitary channels.

Thermal noise in BEC-phononic gravitational wave detectors (2016)
Journal Article
Sabín, C., Kohlrus, J., Bruschi, D. E., & Fuentes, I. (2016). Thermal noise in BEC-phononic gravitational wave detectors. EPJ Quantum Technology, 3(1), Article 8. https://doi.org/10.1140/epjqt/s40507-016-0046-4

Quasiparticles in a Bose-Einstein condensate are sensitive to space-time distortions. Gravitational waves can induce transformations on the state of phonons that can be observed through quantum state discrimination techniques. We show that this metho... Read More about Thermal noise in BEC-phononic gravitational wave detectors.

Towards universal quantum computation through relativistic motion (2016)
Journal Article
Bruschi, D. E., Sabín, C., Kok, P., Johansson, G., Delsing, P., & Fuentes, I. (2016). Towards universal quantum computation through relativistic motion. Scientific Reports, 6, Article 18349. https://doi.org/10.1038/srep18349

We show how to use relativistic motion to generate continuous variable Gaussian cluster states within cavity modes. Our results can be demonstrated experimentally using superconducting circuits where tuneable boundary conditions correspond to mirrors... Read More about Towards universal quantum computation through relativistic motion.

Generating entanglement between two-dimensional cavities in uniform acceleration (2016)
Journal Article
Regula, B., Lee, A. R., Dragan, A., & Fuentes, I. (2016). Generating entanglement between two-dimensional cavities in uniform acceleration. Physical Review D, 93(2), Article 025034. https://doi.org/10.1103/physrevd.93.025034

Moving cavities promise to be a suitable system for relativistic quantum information processing. It has been shown that an inertial and a uniformly accelerated one-dimensional cavity can become entangled by letting an atom emit an excitation while it... Read More about Generating entanglement between two-dimensional cavities in uniform acceleration.

Quantum thermodynamics for a model of an expanding Universe (2016)
Journal Article
Nana Liu, Goold, J., Fuentes, I., Vedral, V., Modi, K., & Bruschi, D. E. (2016). Quantum thermodynamics for a model of an expanding Universe. Classical and Quantum Gravity, 33(3), 035003. https://doi.org/10.1088/0264-9381/33/3/035003

We investigate the thermodynamical properties of quantum fields in curved spacetime. Our approach is to consider quantum fields in curved spacetime as a quantum system undergoing an out-of-equilibrium transformation. The non-equilibrium features are... Read More about Quantum thermodynamics for a model of an expanding Universe.