588 citations · 1.2k across the 34 of their papers we have counts for
30 papers · 1 filter
All Hilbert spaces are the same: consequences for generalized coordinates and momenta
S. J. van Enk, Daniel A. Steck
Making use of the simple fact that all separable complex Hilbert spaces of given dimension are isomorphic, we show that there are just six basic ways to define generalized coordina…
Self-consistent tomography and measurement-device independent cryptography
I. D. Moore, S. J. van Enk
A recurring problem in quantum mechanics is to estimate either the state of a quantum system or the measurement operator applied to it. If we wish to estimate both, then the diffic…
Thermalizing two identical particles
S. J. van Enk
How do indistinguishable identical bosons manage to obey Bose-Einstein statistics---and hence be correlated---even when they do not interact with each other? Part of the answer is…
Detecting false correlations: Uncovering a faked Bell-inequality violation
M. E. Feldman, G. K. Juul, S. J. van Enk +1
It is possible for two parties, Alice and Bob, to establish a secure communication link by sharing an ensemble of entangled particles, and then using these particles to generate a…
Completing Quantum Mechanics with Quantized Hidden Variables
S. J. van Enk
I explore the possibility that a quantum system S may be described completely by the combination of its standard quantum state and a (hidden) quantum state …
Verifying multi-partite mode entanglement of W states
Pavel Lougovski, S. J. van Enk, Kyung Soo Choi +3
We construct a method for verifying mode entanglement of N-mode W states. The ideal W state contains exactly one excitation symmetrically shared between N modes, but our method tak…
The joys of permutation symmetry: direct measurements of entanglement
S. J. van Enk
So-called direct measurements of entanglement are collective measurements on multiple copies of a (bipartite or multipartite) quantum system that directly provide one a value for s…
Quantum Measurement Reliability versus Reversibility
S. J. van Enk, M. G. Raymer
There is a constraining relation between the reliability of a quantum measurement and the extent to which the measurement process is, in principle, reversible. The greater the info…
Detecting and Quantifying Entanglement via Bayesian Updating
Pavel Lougovski, S. J. van Enk
We show how a straightforward Bayesian updating procedure allows one to detect and quantify entanglement from any finite set of measurement results. The measurements do not have to…
Entanglement and purity of single- and two-photon states
Jun O. S. Yin, S. J. van Enk
Whereas single- and two-photon wave packets are usually treated as pure states, in practice they will be mixed. We study how entanglement created with mixed photon wave packets is…
Photons in polychromatic rotating modes
S. J. van Enk, G. Nienhuis
We propose a quantum theory of rotating light beams and study some of its properties. Such beams are polychromatic and have either a slowly rotating polarization or a slowly rotati…
Mesoscopic entanglement of atomic ensembles through non-resonant stimulated Raman scattering
Wenhai Ji, Chunbai Wu, S. J. van Enk +1
We propose a scheme of generating and verifying mesoscopic-level entanglement between two atomic ensembles using non-resonant stimulated Raman scattering. Entanglement can be gener…
On experimental procedures for entanglement verification
S. J. van Enk, N. Lutkenhaus, H. J. Kimble
We give an overview of different types of entanglement that can be generated in experiments, as well as of various protocols that can be used to verify or quantify entanglement. We…
Quantum communication, reference frames and gauge theory
S. J. van Enk
We consider quantum communication in the case that the communicating parties not only do not share a reference frame but use imperfect quantum communication channels, in that each…
Measurement-Induced Entanglement for Excitation Stored in Remote Atomic Ensembles
C. W. Chou, H. de Riedmatten, D. Felinto +3
A critical requirement for diverse applications in Quantum Information Science is the capability to disseminate quantum resources over complex quantum networks. For example, the co…
Decoherence of multi-dimensional entangled coherent states
S. J. van Enk
For entangled states of light both the amount of entanglement and the sensitivity to noise generally increase with the number of photons in the state. The entanglement-sensitivity…
The most robust entangled state of light
S. J. van Enk, O. Hirota
We study how photon absorption losses degrade the bipartite entanglement of entangled states of light. We consider two questions: (i) what state contains the smallest average numbe…
Quantifying the resource of sharing a reference frame
S. J. van Enk
We define a new quantity called refbit, which allows one to quantify the resource of sharing a reference frame in quantum communication protocols. By considering both asymptotic an…
Entangled states of light
S. J. van Enk
These notes are more or less a faithful representation of my talk at the Workshop on ``Quantum Coding and Quantum Computing'' held at the University of Virginia. As such it is an i…
Atoms, dipole waves, and strongly focused light beams
S. J. van Enk
We describe the resonant interaction of an atom with a strongly focused light beam by expanding the field in multipole waves. For a classical field, or when the field is described…
Reduction Theorems for Optimal Unambiguous State Discrimination of Density Matrices
Philippe Raynal, Norbert Lütkenhaus, Steven J. van Enk
We present reduction theorems for the problem of optimal unambiguous state discrimination (USD) of two general density matrices. We show that this problem can be reduced to that of…
On continuous-variable entanglement with and without phase references
S. J. van Enk, Terry Rudolph
We discuss how continous-variable quantum states such as coherent states and two-mode squeezed states can be encoded in phase-reference independent ways.
On entanglement capabilities in infinite dimensions or multi-dimensional entangled coherent states
S. J. van Enk
An example is given of an interaction that produces an infinite amount of entanglement in an infinitely short time, but only a finite amount in longer times. The interaction arises…
Quantum communication protocols using the vacuum
Xiatra Anderson, S. J. van Enk, Terry Rudolph
We speculate what quantum information protocols can be implemented between two accelerating observers using the vacuum. Whether it is in principle possible or not to implement a pr…