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Minimum classical bit for remote preparation and measurement of a qubit
- A. Pati
- Physics, Mathematics
- 6 July 1999
We show that a qubit chosen from equatorial or polar great circles on a Bloch sphere can be remotely prepared with one cbit from Alice to Bob if they share one ebit of entanglement. Also we show that…
Geometric phases for mixed states in interferometry.
This work defines the parallel transport condition that provides a connection form for obtaining the geometric phase for mixed states and reduces to well known formulas in the pure state case when a system undergoes noncyclic and unitary quantum evolution.
Masking Quantum Information is Impossible.
This work shows that quantum qubit commitment-a stronger version of the quantum bit commitment-is not possible in general, and suggests that classical information encoded in composite quantum states may have potential applications in secret sharing and future quantum communication protocols.
Stronger uncertainty relations for all incompatible observables.
Two stronger uncertainty relations are given, relating to the sum of variances, whose lower bound is guaranteed to be nontrivial whenever the two observables are incompatible on the state of the system.
Quantum information cannot be completely hidden in correlations: implications for the black-hole information paradox.
It is shown that the black-hole information paradox becomes more severe, even for cosmologically sized black holes, and either unitarity or Hawking's semiclassical predictions must break down.
Large-scale wind structures in OB-supergiants: a search for rotationally modulated Hα variability
We present the results of a long-term monitoring campaign of the Hline in a sample of bright OB-supergiants (O7.5-B9) that aims at detecting rotationally modulated changes potentially related to the…
Lithium and rotation in F and G dwarfs and subgiants
Lithium abundances have been determined in 127 F and G Pop I stars based on new measurements of the equivalent width of the6707 A Li I line from their high resolution CCD spectra. Distances and…
Maximally coherent mixed states: Complementarity between maximal coherence and mixedness
Quantum coherence is a key element in topical research on quantum resource theories and a primary facilitator for design and implementation of quantum technologies. However, the resourcefulness of…
Perfect teleportation and superdense coding with W states
True tripartite entanglement of the state of a system of three qubits can be classified on the basis of stochastic local operations and classical communications. Such states can be classified into…
Impossibility of deleting an unknown quantum state.
The linearity of quantum theory does not allow us to delete a copy of an arbitrary quantum state perfectly, and this could in principle be useful in quantum computation, where one could store new information in an already computed state by deleting the old information.