Vectorization of quantum operations and its use (2009)
Gilchrist, Alexei, Terno, Daniel R., Wood, Christopher
We give a detailed exposition of the "vectorized" notation for dealing with quantum operations. This notation is used to highlight the relationships between representations of completely-positive...
Black hole information problem and quantum gravity (2009)
The gravity-scalar field system in spherical symmetry provides a natural setting for exploring gravitational collapse and its aftermath in quantum gravity. In a canonical approach, we give...
Dynamics and entanglement in spherically symmetric quantum gravity (2009)
Husain, Viqar, Terno, Daniel R.
The gravity-scalar field system in spherical symmetry provides a natural setting for exploring gravitational collapse and its aftermath in quantum gravity. In a canonical approach, we give...
Quantum tetrahedron and its classical limit (2008)
We present an asymptotically optimal generalized measurement for the Classical information that is retrieved from a quantum tetrahedron is intrinsically fuzzy. We present an asymptotically optimal...
The entropic boundary law in BF theory (2008)
Livine, Etera R., Terno, Daniel R.
We compute the entropy of a closed bounded region of space for pure 3d Riemannian gravity formulated as a topological BF theory for the gauge group SU(2) and show its holographic behavior. More...
Dynamics beyond completely positive maps : some properties and applications (2008)
Carteret, Hilary A, Terno, Daniel R, Życzkowski, Karol
Maps that are not completely positive (CP) are often useful to describe the dynamics of open systems. An apparent violation of complete positivity can occur because there are prior correlations of...
Bulk Entropy in Loop Quantum Gravity (2007)
Livine, Etera R., Terno, Daniel R.
In the framework of loop quantum gravity (LQG), having quantum black holes in mind, we generalize the previous boundary state counting (gr-qc/0508085) to a full bulk state counting. After a suitable...
Quantum causal histories in the light of quantum information (2007)
Livine, Etera R, Terno, Daniel R
We use techniques of quantum information theory to analyze the quantum causal histories approach to quantum gravity. While it is consistent to introduce closed timelike curves (CTCs), they cannot...
Quantum causal histories in the light of quantum information (2006)
Livine, Etera R., Terno, Daniel R.
We use techniques of quantum information theory to analyze the quantum causal histories approach to quantum gravity. We show that while it is consistent to introduce closed timelike curves (CTCs),...
Livine, Etera R., Terno, Daniel R.
After a brief review of spin networks and their interpretation as wave functions for the (space) geometry, we discuss the renormalisation of the area operator in loop quantum gravity. In such a...
Quantum information in loop quantum gravity (2006)
A coarse-graining of spin networks is expressed in terms of partial tracing, thus allowing to use tools of quantum information theory. This is illustrated by the analysis of a simple black hole...
Revzen, Michael, Terno, Daniel R
This special issue of IJQI marks a year since the passing away of Asher Peres. It is a sad honor to be its editors. Eighteen papers from his friends and colleagues represent different (but by no...
Quantum black holes : entropy and entanglement on the horizon (2006)
Livine, Etera R, Terno, Daniel R
We are interested in black holes in Loop Quantum Gravity (LQG). We study the simple model of static black holes: the horizon is made of a given number of identical elementary surfaces and these small...
Inconsistency of quantum-classical dynamics, and what it implies (2006)
A new proof of the impossibility of a universal quantum-classical dynamics is given. It has at least two consequences. The standard paradigm “quantum system is measured by a classical apparatus”...
Physical accessibility of non-completely positive maps (2005)
Carteret, Hilary, Terno, Daniel R., Zyczkowski, Karol
Maps that are not completely positive (CP) are often useful to describe the dynamics of open systems. An apparent violation of complete positivity can occur because there are prior correlations of...
Quantum information in loop quantum gravity (2005)
A coarse-graining of spin networks is expressed in terms of partial tracing, thus allowing to use tools of quantum information theory. This is illustrated by the analysis of a simple black hole...
Quantum Black Holes: Entropy and Entanglement on the Horizon (2005)
Livine, Etera R., Terno, Daniel R.
We are interested in black holes in Loop Quantum Gravity (LQG). We study the simple model of static black holes: the horizon is made of a given number of identical elementary surfaces and these small...
Introduction to relativistic quantum information (2005)
I discuss the role that relativistic considerations play in quantum information processing. First I describe how the causality requirements limit possible multi-partite measurements. Then the Lorentz...
From qubits to black holes: entropy, entanglement and all that (2005)
Entropy plays a crucial role in characterization of information and entanglement, but it is not a scalar quantity and for many systems it is different for different relativistic observers. Loop...
Entanglement of zero angular momentum mixtures and black hole entropy (2005)
Livine, Etera R., Terno, Daniel R.
We calculate the entanglement of formation and the entanglement of distillation for arbitrary mixtures of the zero spin states on an arbitrary-dimensional bipartite Hilbert space. Such states are...
Entropy, holography and the second law (2004)
The geometric entropy in quantum field theory is not a Lorentz scalar and has no invariant meaning, while the black hole entropy is invariant. Renormalization of entropy and energy for reduced...
The effect of focusing on polarization qubits (2004)
Lindner, Netanel H., Terno, Daniel R.
When a photon with well-defined polarization and momentum passes through a focusing device, these properties are no longer well defined. Their loss is captured by describing polarization by a 3x3...
Relativistically Invariant Quantum Information (2004)
Bartlett, Stephen D., Terno, Daniel R.
We show that quantum information can be encoded into entangled states of multiple indistinguishable particles in such a way that any inertial observer can prepare, manipulate, or measure the encoded...
Relativistically Invariant Quantum Information (2004)
Bartlett, Stephen D., Terno, Daniel R.
We show that quantum information can be encoded into entangled states of multiple indistinguishable particles in such a way that any inertial observer can prepare, manipulate, or measure the encoded...
Relativistically invariant quantum information (2004)
Bartlett, Stephen D., Terno, Daniel R.
We show that quantum information can be encoded into entangled states of multiple indistinguishable particles in such a way that any inertial observer can prepare, manipulate, or measure the encoded...
Relativistically Invariant Quantum Information (2004)
Bartlett, Stephen D., Terno, Daniel R.
We show that quantum information can be encoded into entangled states of multiple indistinguishable particles in such a way that any inertial observer can prepare, manipulate, or measure the encoded...
Inconsistency of quantum--classical dynamics, and what it implies (2004)
A new proof of the impossibility of a universal quantum-classical dynamics is given. It has at least two consequences. The standard paradigm ``quantum system is measured by a classical apparatus" is...
Relativistically Invariant Quantum Information (2004)
Bartlett, Stephen D., Terno, Daniel R.
We show that quantum information can be encoded into entangled states of multiple indistinguishable particles in such a way that any inertial observer can prepare, manipulate, or measure the encoded...
Relativistically Invariant Quantum Information (2004)
Bartlett, Stephen D., Terno, Daniel R.
We show that quantum information can be encoded into entangled states of multiple indistinguishable particles in such a way that any inertial observer can prepare, manipulate, or measure the encoded...
Elliptic Rydberg states as direction indicators (2003)
Lindner, Netanel H., Peres, Asher, Terno, Daniel R.
The orientation in space of a Cartesian coordinate system can be indicated by the two vectorial constants of motion of a classical Keplerian orbit: the angular momentum and the Laplace-Runge-Lenz...
Wigner's little group and Berry's phase for massless particles (2003)
Lindner, Netanel H., Peres, Asher, Terno, Daniel R.
The ``little group'' for massless particles (namely, the Lorentz transformations $\Lambda$ that leave a null vector invariant) is isomorphic to the Euclidean group E2: translations and rotations in a...
Quantum information and special relativity (2003)
Peres, Asher, Terno, Daniel R.
Relativistic effects affect nearly all notions of quantum information theory. The vacuum behaves as a noisy channel, even if the detectors are perfect. The standard definition of a reduced density...
Quantum Information and Relativity Theory (2002)
Peres, Asher, Terno, Daniel R.
Quantum mechanics, information theory, and relativity theory are the basic foundations of theoretical physics. The acquisition of information from a quantum system is the interface of classical and...
Energy density and localization of particles (2002)
We consider the use of the energy density for describing a localization of relativistic particles. This method is consistent with the causality requirements. The related positive operator valued...
Relativistic Doppler effect in quantum communication (2002)
Peres, Asher, Terno, Daniel R.
When an electromagnetic signal propagates in vacuo, a polarization detector cannot be rigorously perpendicular to the wave vector because of diffraction effects. The vacuum behaves as a noisy...
Two roles of relativistic spin operators (2002)
Operators that are associated with several important quantities, like angular momentum, play a double role: they are both generators of the symmetry group and ``observables.'' The analysis of...
Quantum entropy and special relativity (2002)
Peres, Asher, Scudo, Petra F., Terno, Daniel R.
We consider a single free spin 1/2 particle. The reduced density matrix for its spin is not covariant under Lorentz transformations. The spin entropy is not a relativistic scalar and has no invariant...
Extension of quantum information theory to curved spacetimes (2001)
The representation of measurements by positive operator valued measures and the description of the most general state transformations by means of completely positive maps are two basic concepts of...
Lorentz transformations of open systems (2001)
Peres, Asher, Terno, Daniel R.
We consider open dynamical systems, subject to external interventions by agents that are not completely described by the theory (classical or quantal). These interventions are localized in regions...
Comment on `Counterfactual entanglement and non-local correlations in separable states' (1999)
The arguments of Cohen [Phys. Rev. A {\bf 60}, 80 (1999)] against the `ignorance interpretation' of mixed states are questioned. The physical arguments are shown to be inconsistent and the supporting...
Sufficient conditions for a disentanglement (1999)
We consider a disentanglement process in which local properties of an entangled state are preserved, while the entanglement between the subsystems is erased. Sufficient conditions for a perfect...
Non-linear operations in quantum information theory (1998)
Quantum information theory is used to analize various non-linear operations on quantum states. The universal disentanglement machine is shown to be impossible, and partial (negative) results are...
Optimal distinction between non-orthogonal quantum states (1998)
Abstract. Given a finite set of linearly independent quantum states, an observer who examines a single quantum system may sometimes identify its state with certainty. However, unless these quantum...
Convex probability domain of generalized quantum measurements (1998)
Generalized quantum measurements with N distinct outcomes are used for determining the density matrix, of order d, of an ensemble of quantum systems. The resulting probabilities are represented by a...