Results 111 to 120 of about 9,805 (195)

Sharing of Nonlocality of a Single Member of an Entangled Pair of Qubits Is Not Possible by More than Two Unbiased Observers on the Other Wing

Mathematics, 2016
We address the recently posed question as to whether the nonlocality of a single member of an entangled pair of spin 1 / 2 particles can be shared among multiple observers on the other wing who act sequentially and independently of each other. We
Shiladitya Mal, Archan S. Majumdar, Dipankar Home   +2 more
doaj   +1 more source

Robust projective measurements through measuring code-inspired observables

npj Quantum Information
Quantum measurements are ubiquitous in quantum information processing tasks, but errors can render their outputs unreliable. Here, we present a scheme that implements a robust projective measurement through measuring code-inspired observables.
Yingkai Ouyang
doaj   +1 more source

Coarse-grained quantum state tomography with optimal POVM construction

Physical Review Research
In a multiqubit system, when a detector's resolution is insufficient to distinguish between qubits, individual qubit measurement becomes impractical. This limitation results in coarse-grained (CG) measurements that dilute system information and, more ...
Donghun Jung, Young-Wook Cho, Yosep Kim, Junghyun Lee   +3 more
doaj   +1 more source

Qubit POVMs by destructive weak measurements

, 2018
Many quantum measurements, such as photodetection, can be destructive. In photodetection, when the detector clicks a photon has been absorbed and destroyed. Yet the lack of a click also gives information about the presence or absence of a photon. In monitoring the emission of photons from a source, one decomposes the strong measurement into a series of
Chen, Yi-Hsiang, Brun, Todd A.
openaire   +2 more sources

Quantifying the intrinsic randomness in sequential measurements

New Journal of Physics
In the standard Bell scenario, when making a local projective measurement on each system component, the amount of randomness generated is restricted.
Xinjian Liu, Yukun Wang, Yunguang Han, Xia Wu   +3 more
doaj   +1 more source

SIC-POVMs exist in all dimensions

, 2007
This paper has been withdrawn by the author due to mathematical errors.
Hall, Joanne L., Rao, Asha
openaire   +2 more sources

SIC-POVMs: A new computer study

, 2009
20 pages + 189 pages of raw data (also accessible in the source in plain text files); further algebraic solutions for d=11 and d=14 ...
Scott, A. J., Grassl, M.
openaire   +2 more sources

Universal programmable unambiguous discrimination of two unknown states with two copies

AIP Advances
We investigate the universal programmable unambiguous discrimination of two unknown quantum states with two copies. We first present the optimal positive-operator valued measure (POVM) elements that determine the individual success probabilities.
Shou-Ya Wang, Wen-Hai Zhang
doaj   +1 more source

SIC-POVMs and the Knaster's Conjecture

Symmetric Informationally Complete Positive Operator-Valued Measures (SIC-POVMs) have been constructed in many dimensions using the Weyl-Heisenberg group. In the quantum information community, it is commonly believed that SCI-POVMs exist in all dimensions; however, the general proof of their existence is still an open problem.
Samuel, S. B., Gedik, Z.
openaire   +2 more sources

Gradient-descent methods for scalable quantum detector tomography

New Journal of Physics
We present a technique for performing quantum detector tomography of phase insensitive quantum detectors, a category under which many detectors of interest fall under, using gradient descent-based optimization to learn the positive operator-valued ...
Amanuel Anteneh, Olivier Pfister
doaj   +1 more source