112 citations · 576 across the 12 of their papers we have counts for
12 papers
Quantizing time: Interacting clocks and systems
Alexander R. H. Smith, Mehdi Ahmadi
This article generalizes the conditional probability interpretation of time in which time evolution is realized through entanglement between a clock and a system of interest. This…
Massive Unruh particles cannot be directly observed
Filip Kiałka, Alexander R. H. Smith, Mehdi Ahmadi +1
We show that massive particles created in a relativistically accelerated reference frame, as predicted by the Unruh effect, can only be found in a tiny layer above the event horizo…
Relativistic (2,3)-threshold quantum secret sharing
Mehdi Ahmadi, Ya-Dong Wu, Barry C. Sanders
In quantum secret sharing protocols, the usual presumption is that the distribution of quantum shares and players' collaboration are both performed inertially. Here we develop a qu…
Quantification and manipulation of magic states
Mehdi Ahmadi, Hoan Bui Dang, Gilad Gour +1
Magic states can be used as a resource to circumvent the restrictions due to stabilizer-preserving operations, and magic-state conversion has not been studied in the single-copy re…
Spatial entanglement of nonvacuum Gaussian states
Filip Kiałka, Mehdi Ahmadi, Andrzej Dragan
The vacuum state of a relativistic quantum field contains entanglement between regions separated by spacelike intervals. Such spatial entanglement can be revealed using an operatio…
Effect of relativistic acceleration on localized two-mode Gaussian quantum states
Mehdi Ahmadi, Krzysztof Lorek, Agata Chęcińska +3
We study how an arbitrary Gaussian state of two localized wave packets, prepared in an inertial frame of reference, is described by a pair of uniformly accelerated observers. We ex…
Communication between inertial observers with partially correlated reference frames
Mehdi Ahmadi, Alexander R. H. Smith, Andrzej Dragan
In quantum communication protocols the existence of a shared reference frame between two spatially separated parties is normally presumed. However, in many practical situations we…
Quantum parameter estimation with imperfect reference frames
Dominik Šafránek, Mehdi Ahmadi, Ivette Fuentes
Quantum metrology studies quantum strategies which enable us to outperform their classical counterparts. In this framework, the existence of perfect classical reference frames is u…
Phonon creation by gravitational waves
Carlos Sabín, David Edward Bruschi, Mehdi Ahmadi +1
We show that gravitational waves create phonons in a Bose-Einstein condensate (BEC). A traveling spacetime distortion produces particle creation resonances that correspond to the d…
Quantum metrology for relativistic quantum fields
Mehdi Ahmadi, David Edward Bruschi, Ivette Fuentes
In quantum metrology quantum properties such as squeezing and entanglement are exploited in the design of a new generation of clocks, sensors and other measurement devices that can…
Relativistic Quantum Metrology: Exploiting relativity to improve quantum measurement technologies
Mehdi Ahmadi, David Edward Bruschi, Carlos Sabín +2
We present a framework for relativistic quantum metrology that is useful for both Earth-based and space-based technologies. Quantum metrology has been so far successfully applied t…
Dynamics of a quantum reference frame undergoing selective measurements and coherent interactions
Mehdi Ahmadi, David Jennings, Terry Rudolph
We consider the dynamics of a quantum directional reference frame undergoing repeated interactions. We first describe how a precise sequence of measurement outcomes affects the ref…