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On the Decompositions of a Quantum State [PDF]
Journal of Mathematical Analysis and Applications, 1997 The paper is devoted to the decompositions of a quantum state as a weighted sum of one-dimensional projectors. It gives a complete characterization of all the decompositions of a given state, and describes explicitly the set of irreducible decompositions. Finally, a class of decomposition is particularized that have relevance both from the physical and
CASSINELLI, GIOVANNI +2 more
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Physics Letters B, 2014 We revisit the definition of rotating thermal states for scalar and fermion fields in unbounded Minkowski space-time. For scalar fields such states are ill-defined everywhere, but for fermion fields an appropriate definition of the vacuum gives thermal states regular inside the speed-of-light surface.
Ambrus, V.E., Winstanley, E.
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Quantum State Interferography [PDF]
Physical Review Letters, 2020 Quantum State Tomography (QST) has been the traditional method for characterization of an unknown state. Recently, many direct measurement methods have been implemented to reconstruct the state in a resource efficient way. In this letter, we present an interferometric method, in which, any qubit state, whether mixed or pure, can be inferred from the ...
Surya Narayan Sahoo +3 more
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Quantum-state decorrelation [PDF]
Physical Review A, 2008 We address the general problem of removing correlations from quantum states while preserving local quantum information as much as possible. We provide a complete solution in the case of two qubits, by evaluating the minimum amount of noise that is necessary to decorrelate covariant sets of bipartite states.
D'Ariano G M +3 more
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Quantum state of the multiverse [PDF]
Physical Review D, 2010 15 pages, 2 ...
Robles Pérez, Salvador +1 more
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Light: Science & Applications, 2023 The Feynman-Tan relation, obtained by combining the Feynman energy relation with the Tan’s two-body contact, can explain the excitation spectra of strongly interacting 39K Bose-Einstein condensate (BEC).
Yunfei Wang +7 more
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Isometries of quantum states [PDF]
Journal of Physics A: Mathematical and General, 2002 This paper treats the isometries of metric spaces of quantum states. We consider two metrics on the set all quantum states, namely the Bures metric and the one which comes from the trace-norm. We describe all the corresponding (nonlinear) isometries and also present similar results concerning the space of all (non-normalized) density operators.
Werner Timmermann, Lajos Molnár
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Continuous Variable Quantum State Sharing via Quantum Disentanglement [PDF]
, 2005 Quantum state sharing is a protocol where perfect reconstruction of quantum states is achieved with incomplete or partial information in a multi-partite quantum networks.
A. Furusawa +9 more
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Long-lived and multiplexed atom-photon entanglement interface with feed-forward-controlled readouts
Communications Physics, 2021 The quantum interface to generate entanglement between a flying photonic qubit and a stationary qubit is a key functionality for the quantum internet. The authors demonstrate a multiplexed quantum interface that stores three long-lived spin-wave qubits ...
Sheng-zhi Wang +6 more
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On the reality of the quantum state [PDF]
Nature Physics, 2012 5+3 pages, 3+2 figures.
Pusey, M, Barrett, J, Rudolph, T
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