278 citations · 1.8k across the 45 of their papers we have counts for
33 papers · 1 filter
Superpositions of thermalisations in relativistic quantum field theory
Joshua Foo, Magdalena Zych
Recent results in relativistic quantum information and quantum thermodynamics have independently shown that in the quantum regime, a system may fail to thermalise when subject to q…
Relativistic Unruh-DeWitt detectors with quantized center of mass
Evan P. G. Gale, Magdalena Zych
In this paper, we extend the Unruh-DeWitt (UDW) model to include a relativistic quantized center of mass (c.m.) for the detector, which traditionally has a classical c.m. and follo…
Mass-energy equivalence in gravitationally bound quantum states of the neutron
Germain Tobar, Simon Haine, Fabio Costa +1
Gravitationally bound neutrons have become an important tool in the experimental searches for new physics, such as modifications to Newton's force or candidates for dark matter par…
Quantized mass-energy effects in an Unruh-DeWitt detector
Carolyn E. Wood, Magdalena Zych
A simple but powerful particle detector model consists of a two-level system coupled to a field, where the detected particles are the field excitations. This is known as the Unruh-…
Indefinite temporal order without gravity
Kacper Dębski, Magdalena Zych, Fabio Costa +1
According to the general theory of relativity, time can flow at different rates depending on the configuration of massive objects, affecting the temporal order of events. Recent re…
Operational models of temperature superpositions
Carolyn E. Wood, Harshit Verma, Fabio Costa +1
A quantum system and a thermal bath can reach thermal equilibrium through an interaction, whereupon the system acquires the same temperature as the bath. But how does a delocalised…
Telefilters, telemirrors, and causality
Joshua Foo, Sho Onoe, Magdalena Zych +1
We present new theoretical models for quantum optical mode-selective filters and mirrors using continuous-variable teleportation. We call these devices telefilters and telemirrors…
Constraining the number of fundamental quantum degrees of freedom using gravity
Harshit Verma, Magdalena Zych, Fabio Costa
We consider the effect of gravity on extended quantum systems (EQS) in the low energy regime. We model the gravitational effect due to a nearby source mass as a redshift in the int…
Entanglement amplification between superposed detectors in flat and curved spacetimes
Joshua Foo, Robert B. Mann, Magdalena Zych
We consider an entanglement harvesting protocol between two Unruh-deWitt detectors in quantum superpositions of static trajectories in the static de Sitter and thermal Minkowski sp…
Thermality, causality and the quantum-controlled Unruh-deWitt detector
Joshua Foo, Sho Onoe, Robert B. Mann +1
Particle detector models such as the Unruh-deWitt detector are widely used in relativistic quantum information and field theory to probe the global features of spacetime and quantu…
Generating multi-partite entanglement from the quantum vacuum with a finite-lifetime mirror
Joshua Foo, Sho Onoe, Magdalena Zych +1
Observers following special classes of finite-lifetime trajectories have been shown to experience an effective temperature, a generalisation of the Unruh temperature for uniformly…
Unruh-deWitt detectors in quantum superpositions of trajectories
Joshua Foo, Sho Onoe, Magdalena Zych
Unruh-deWitt detectors have been utilised widely as probes for quantum particles, entanglement and spacetime curvature. Here, we extend the standard treatment of an Unruh-deWitt de…
Quantum Temporal Superposition: the case of QFT
Laura J. Henderson, Alessio Belenchia, Esteban Castro-Ruiz +4
Quantum field theory is completely characterized by the field correlations between spacetime points. In turn, some of these can be accessed by locally coupling to the field simple…
Effect of environment on the interferometry of clocks
Harshit Verma, Magdalena Zych, Fabio Costa
Quantum interference of "clocks", namely of particles with time-evolving internal degrees of freedom (DOFs), is a promising avenue to test genuine general relativistic effects in q…
Composite particles with minimum uncertainty in spacetime
Carolyn E. Wood, Magdalena Zych
Composite particles---atoms, molecules, or microspheres---are unique tools for testing joint quantum and general relativistic effects, macroscopic limits of quantum mechanics, and…
Nanomechanical test of quantum linearity
Stefan Forstner, Magdalena Zych, Sahar Basiri-Esfahani +2
Spontaneous wavefunction collapse theories provide the possibility to resolve the measurement problem of quantum mechanics. However, the best experimental tests have been limited b…
Mass-energy equivalence in harmonically trapped particles
Rebecca Haustein, Gerard J. Milburn, Magdalena Zych
Precise understanding of the dynamics of trapped particles is crucial for nascent quantum technologies, including atomic clocks and quantum simulators. Here we present a framework…
Puzzling out the mass-superselection rule
Magdalena Zych, Daniel M. Greenberger
Mass-superselection rule (MSR) states that in the non-relativistic quantum theory superpositions of states with different masses are unphysical. While MSR features even in textbook…
Interference of Clocks: A Quantum Twin Paradox
Sina Loriani, Alexander Friedrich, Christian Ufrecht +15
The phase of matter waves depends on proper time and is therefore susceptible to special-relativistic (kinematic) and gravitational (redshift) time dilation. Hence, it is conceivab…
Relativity of quantum superpositions
Magdalena Zych, Fabio Costa, Timothy C. Ralph
In modern physics only relative quantities are considered to have physical significance. For example, position assigned to a system depends on the choice of coordinates, and only r…
Experimental entanglement of temporal order
Giulia Rubino, Lee A. Rozema, Francesco Massa +4
The study of causal relations has recently been applied to the quantum realm, leading to the discovery that not all physical processes have a definite causal structure. While indef…
Bell's Theorem for Temporal Order
Magdalena Zych, Fabio Costa, Igor Pikovski +1
Time has a fundamentally different character in quantum mechanics and in general relativity. In quantum theory events unfold in a fixed time order while in general relativity tempo…
Comment on "Quantum mechanics for non-inertial observers"
Igor Pikovski, Magdalena Zych, Fabio Costa +1
In a recent paper (arXiv:1701.04298 [quant-ph]) Toroš, Großardt and Bassi claim that the potential necessary to support a composite particle in a gravitational field must necessari…
Gravity is not a Pairwise Local Classical Channel
Natacha Altamirano, Paulina Corona-Ugalde, Robert B. Mann +1
It is currently believed that there is no experimental evidence on possibly quantum features of gravity or gravity-motivated modifications of quantum mechanics. Here we show that s…