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No-signaling bounds for quantum cloning and metrology
Pavel Sekatski, Michalis Skotiniotis, Wolfgang Dür
The impossibility of superluminal communication is a fundamental principle of physics. Here we show that this principle underpins the performance of several fundamental tasks in qu…
Deterministic superreplication of one-parameter unitary transformations
W. Dür, P. Sekatski, M. Skotiniotis
We show that one can deterministically generate out of copies of an unknown unitary operation up to almost perfect copies. The result holds for all operations generated b…
Algebraic metrology: Pretty good states and bounds
Michalis Skotiniotis, Florian Fröwis, Wolfgang Dür +1
We investigate quantum metrology using a Lie algebraic approach for a class of Hamiltonians, including local and nearest-neighbor interaction Hamiltonians. Using this Lie algebraic…
Measurement-based implementation makes entanglement purification based on hashing practical
M. Zwerger, H. J. Briegel, W. Dür
We investigate entanglement purification protocols based on hashing, where a large number of noisy entangled pairs is jointly processed to obtain a reduced number of perfect, noise…
Optimal quantum states for frequency estimation
F. Fröwis, M. Skotiniotis, B. Kraus +1
We investigate different quantum parameter estimation scenarios in the presence of noise, and identify optimal probe states. For frequency estimation of local Hamiltonians with dep…
Implementing quantum control for unknown subroutines
Nicolai Friis, Vedran Dunjko, Wolfgang Dür +1
We present setups for the practical realization of adding control to unknown subroutines, supplementing the existing quantum optical scheme for black-box control with a counterpart…