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For the first time, researchers at MIT, Caltech, Harvard University, and elsewhere sent quantum information across a quantum system in what could be understood as traversing a wormhole. Though this ex...
Topology and entanglement are two powerful principles for characterizing the structure of complex quantum states. In a new paper in the journal Physical Review X, researchers from the University of Pe...
A publicly verifiable quantum blind signature scheme without entanglement based on asymmetric cryptography
Undeniable quantum signature scheme Impersonation attack Quantum asymmetric cryptography
2019/7/15
In recent years, several cryptographic scholars have proposed quantum blind signature schemes. However, their methods require the signatories and the inspectors to share common keys in advance, which ...
The Entanglement Structure of Quantum Field Systems
relativistic quantum field theory algebraic approach ontology quantum fields quantum entanglement Reeh-Schlieder theorem non-separability ontic structural realism
2016/6/14
This essay considers the question of the ontology of relativistic quantum field theory (RQFT). It aims to discuss possible implications of the peculiarities of quantum entanglement and quantum non-loc...
Relativity,Quantum Entanglement,Counterfactuals,and Causation
Causation Counterfactuals Relativity Entanglement
2016/6/13
We investigate whether standard counterfactual analyses of causation (CACs) imply that the outcomes of space-like separated measurements on entangled particles are causally related. While it has somet...
Delayed-Choice Experiments and the Metaphysics of Entanglement
Delayed-choice experiments double-slit experiment entanglement swapping quantum eraser realism
2016/6/13
Delayed-choice experiments in quantum mechanics are often taken to undermine a realistic interpretation of the quantum state. More specifically, Healey has recently argued that the phenomenon of delay...
On the Necessity of Entanglement for the Explanation of Quantum Speedup
quantum computation quantum speedup quantum information entanglement DQC1 mixed state explanation
2016/6/12
Of the many and varied applications of quantum information theory, perhaps the most fascinating is the sub-field of quantum computation. In this sub-field, computational algorithms are designed which ...
Entanglement-based quantum key distribution with biased basis choice via free space
Entanglement-based quantum key distribution iased basis choice via free space
2016/1/23
We report a free-space entanglement-based quantum key dis-tribution experiment, implementing the biased basis protocol between two sites which are 15.3 km apart. Photon pairs from a polarization-entan...
Experimental Observation of Entanglement Duality for Identical Particles
entanglement duality quantum indistinguishability quantum mechanics
2016/1/22
It was shown recently that entanglement of identical particles has a feature called dualism (Bose and Home 2013 Phys. Rev. Lett. 110 140404), which is funda-mentally connected with quantum indistingui...
Implementation of a Measurement-Device-Independent Entanglement Witness
Measurement-Device-Independent Entanglement Witness
2016/1/22
Entanglement, the essential resource in quantum information processing, should be witnessed in many tasks such as quantum computing and quantum communication. The conventional entanglement witness met...
Entanglement-free Certification of Entangling Gates
Entanglement-free Certification Entangling Gates
2016/1/22
Not all quantum protocols require entanglement to outperform their classical alternatives. The nonclassical correlations that lead to a quantum advantage are conjectured to be captured by quantum disc...
Quantum entanglement is an essential resource in quantum information processing,which needs to be verified in many tasks such as quantum cryptography and computation. Due to imperfect detection device...
One-step generation of multipartite entanglement among nitrogen-vacancy center ensembles
One-step generation multipartite entanglement nitrogen-vacancy center ensembles
2016/1/22
We describe a one-step, deterministic and scalable scheme for creating macroscopic arbitrary entangled coherent states (ECSs) of separate nitrogen-vacancy center ensembles (NVEs) that couple to a supe...
Two-component Structure in the Entanglement Spectrum of Highly Excited States
Two-component Structure Entanglement Spectrum Highly Excited States
2016/1/22
We study the entanglement spectrum of highly excited eigenstates of two known models that exhibit a many-body localization transition, namely the one-dimensional random-field Heisenberg model and the ...
Characterizing entanglement of an artificial atom and a cavity cat state with Bell’s inequality
Characterizing entanglement cavity cat state Bell’s inequality
2016/1/22
The Schrodinger’s cat thought experiment highlights the counterintuitive concept of entan-glement in macroscopically distinguishable systems. The hallmark of entanglement is the detection of strong co...