Towards Quantum Science Experiments with Satellites
Thomas Jennewein Institute for Quantum Computing (IQC)
PIRSA:12060057
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Relativistic Quantum Information anRelativistic Quantum Optics: towards experiments to reveal quantum effects provoked by gravity
Eduardo Martin-Martinez University of Waterloo
PIRSA:12060043 -
On-chip Extraction of Quantum Correlations from the Vacuum
PIRSA:12060056 -
Entanglement Resonances
PIRSA:12060055 -
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Localised Detection of the Unruh Effect
PIRSA:12060052 -
Localised Detection of Relativistic Quantum Fields in Non-Inertial Frames
Andrzej Dragan University of Warsaw
PIRSA:12060040 -
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Nonlocality, Entanglement Witnesses and Supra-Correlations
Paul Alsing United States Air Force Research Laboratory
PIRSA:12060076 -
Towards Universal Quantum Computation Out of Relativistic Motion of Particle Detectors
David Aasen California Institute of Technology
PIRSA:12060049 -
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Towards Quantum Science Experiments with Satellites
Thomas Jennewein Institute for Quantum Computing (IQC)
PIRSA:12060057Space offers a very unique environment for quantum physics experiments at regimes for distance and velocity not possible on ground. In the recent years there have been a range of theoretical and experimental studies towards the feasibility of performing quantum physics and quantum information science experiments in space. The most advanced quantum application is quantum cryptography, known as quantum key distribution (QKD), which can be extended to global distances by bringing suitable quantum systems into space. It is interesting to note that with quantum satellites in Earth's orbit, we will be able to perform tests on the validity of quantum physics and entanglement at huge length scales and velocities. This could provide a possible route towards gaining insights into the interplay of quantum physics and relativity. I will review some of the interesting quantum entanglement tests that can be performed with satellites in space. I will also outline a proposed satellite mission that is based on existing technology on a small-scale satellite, and could be a first important step into this direction. -
Relativistic Quantum Information anRelativistic Quantum Optics: towards experiments to reveal quantum effects provoked by gravity
Eduardo Martin-Martinez University of Waterloo
PIRSA:12060043We will explore different results on relativistic quantum information and general relativistic quantum optics whose aim is to provide scenarios where relativistic quantum effects can be experimentally accessible. Traditionally, relativistic quantum information has been far away from the experimental test, but the discipline is close to the transition point where experimental outcomes will soon arise. Not only to bestow experimental proof on long ago predicted but still undetected phenomena (such as the Unruh and Hawking effects), but also to provide insight into the relationship of general relativity and quantum theory, and to serve as a source of new quantum technologies.
We will show how it is possible to extract timelike and spacelike quantum correlations from the vacuum state of the field in a tabletop experiment, and how to use it to build a quantum memory. We will see how geometric phases can help to detect the Unruh effect and how to use what we learn from that setting to build a quantum thermometer. Finally we will discuss how quantum simulators can be applied to the study of quantum effects of gravity, and used to predict experimental scenarios way beyond current computational power of classical computers. -
On-chip Extraction of Quantum Correlations from the Vacuum
PIRSA:12060056 -
Entanglement Resonances
PIRSA:12060055We investigate entanglement creation between modes of a quantum field contained within a cavity which undergoes noninertial motion. We find that, in the the low acceleration regime, or equivalently in the small cavity regime, entanglement can be created from initially separable states and it can be linearly increased by repeating travel scenarios. We are able to fin analytically how all the parameter involved affect the entanglement. We suggest that this can be of interest when looking for experimental veriications of predictions within the field of relativistic quantum information.
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Quantum Time-Like Curves: From Thought Experiment to Real Experiment
PIRSA:12060053Thought experiments involving quantum mechanics in the presence of closed time-like curves (CTCs) seem to have little to do with reality. However, even particles that traverse the CTC passively and without interactions can lead to highly non-trivial effects, such as the maximal violation of the uncertainty principle. Moreover, these effects may carry over to curved space-times without CTCs, presenting novel opportunities for testing non-standard physics in the relativistic regime. -
Localised Detection of the Unruh Effect
PIRSA:12060052I will discuss a new proposal with the potential to experimentally probe the validity of Rindler quantisation from the recent completely localized framework of non-inertial projective detectors of quantum fields. -
Localised Detection of Relativistic Quantum Fields in Non-Inertial Frames
Andrzej Dragan University of Warsaw
PIRSA:12060040We introduce a novel approach to measurements in QFT in non-inertial frames. A simple, localised, analytical model of state detection allows us to study all the standard questions of RQI and yielding simple answers with a clear physical interpretation. We apply the model to investigate extraction of the entanglement from the vacuum, completely characterize entangled state of two localised inertial wave-packets in the accelerating frame and study the entanglement degradation as a function of the proper acceleration of the detector. -
Quantum Interference of “Clocks”
Časlav Brukner Austrian Academy of Sciences
PIRSA:12060050Experimental tests of general relativity performed so far involve systems that can be effectively described by classical physics. On the other hand, observed gravity effects on quantum systems do not go beyond the Newtonian limit of the theory. In light of the conceptual differences between general relativity and quantum mechanics, as well as those of finding a unified theoretical framework for the two theories, it is of particular interest to look for feasible experiments that can only be explained if both theories apply. We propose testing general relativistic time dilation with a single “clock” in a superposition of two paths in space-time, along which time flows at different rates. We show that the interference visibility in such an experiment will decrease to the extent to which the path information becomes available from reading out the time from the “clock”. This effect would provide the first test of the genuine general relativistic notion of time in quantum mechanics. We consider implementation of the “clock” in evolving internal degrees of freedom of a massive particle and, alternatively, in the external degree of a photon and analyze the feasibility of the experiment. -
Nonlocality, Entanglement Witnesses and Supra-Correlations
Paul Alsing United States Air Force Research Laboratory
PIRSA:12060076While entanglement is believed to underlie the power of quantum computation and communication, it is not generally well understood for multipartite systems. Recently, it has been appreciated that there exists proper no-signaling probability distributions derivable from operators that do not represent valid quantum states. Such systems exhibit supra-correlations that are stronger than allowed by quantum mechanics, but less than the algebraically allowed maximum in Bell-inequalities (in the bipartite case). Some of these probability distributions are derivable from an entanglement witness W, which is a non-positive Hermitian operator constructed such that its expectation value with a separable quantum state (positive density matrix) rho_sep is non-negative (so that Tr[W rho]< 0 indicates entanglement in quantum state rho). In the bipartite case, it is known that by a modification of the local no-signaling measurements by spacelike separated parties A and B, the supra-correlations exhibited by any W can be modeled as derivable from a physically realizable quantum state ρ. However, this result does not generalize to the n-partite case for n>2. Supra-correlations can also be exhibited in 2- and 3-qubit systems by explicitly constructing "states" O (not necessarily positive quantum states) that exhibit PR correlations for a fixed, but arbitrary number, of measurements available to each party. In this paper we examine the structure of "states" that exhibit supra-correlations. In addition, we examine the affect upon the distribution of the correlations amongst the parties involved when constraints of positivity and purity are imposed. We investigate circumstances in which such "states" do and do not represent valid quantum states. -
Towards Universal Quantum Computation Out of Relativistic Motion of Particle Detectors
David Aasen California Institute of Technology
PIRSA:12060049 -
Boundary Effects on Quantum Entanglement and its Dynamics in a Detector-Field System
PIRSA:12060074We analyze an exactly solvable model consisting of an inertial Unruh-DeWitt detector which interacts linearly with a massless quantum field in Minkowski spacetime with a perfectly reflecting flat plane boundary. This model is related to proposed mirror-field superposition and relevant experiments in macroscopic quantum phenomena, as well as atomic fluctuation forces near a conducting surface. Firstly a coupled set of equations for the detector’s and the field’s Heisenberg operators are derived. After coarse graining the field, the dynamics of the detector’s internal degreeof freedom is described by a quantum Langevin equation, where the dissipation and noise kernels respectively correspond to the retarded Green’s functions and Hadamard elementary functions of the free quantum field in half space. We use the linear entropy as measures of entanglement between the detector and the quantum field under mirror reflection, then solve the early-time detector-fieldentanglement dynamics. At late times when the combined system is in a stationary state, we obtain exact expressions for the detector’s covariance matrix and show that the detector-field entanglement decreases for smaller separation between the detector and the mirror.We explain the behavior of detector-field entanglement qualitatively with the help of a detector’s mirror image, compare them with the case of two real detectors and explain the differences.