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Behavior of Quantum Fisher Information of Bell Pairs under Decoherence Channels

100%
Ozaydin F., Altintas A., Bugu S., Yesilyurt C.
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vol. 125
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issue 2
606-607
EN
Quantum Fisher information has recently been an essential tool for analyzing the phase sensitivity of the quantum states in various quantum tasks, requiring high precision, such as quantum clock synchronization, positioning and many applications which include quantum interferometers. Due to the interactions with the environment, all quantum systems are subject to various decoherence effects. Therefore the research on quantum Fisher information under decoherence has been recently attracting more attention. In this work, analyzing the quantum Fisher information, we study the phase sensitivity of bipartite quantum correlations, in particular four Bell pairs amplitude damping channels. For a specific Bell state we arrive at similar results of Greenberger-Horne-Zeilinger (GHZ) states (as expected). For the other three Bell states, we present our results which point the interesting behavior of quantum Fisher information with respect to the decoherence rate. We also find the regions where the quantum Fisher information exhibits discontinuities.
2
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Quantum Fisher Information of Bipartitions of W States

88%
Ozaydin F., Altintas A., Yesilyurt C., Bugu S., Erol V.
Acta Physica Polonica A
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2015
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vol. 127
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issue 4
1233-1235
EN
We study the quantum Fisher information (QFI) of W states and W-like states under decoherence. In particular, we find that on the contrary to amplitude damping and depolarizing decoherence, a W-like state of 3 qubits obtained by discarding 1 qubit of a genuine W state of 4 qubits is more robust than a genuine W state of 3 qubits under amplitude amplifying and phase damping decoherence.
3
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An Optical Setup for Deterministic Creation of Four Partite W state

88%
Yesilyurt C., Bugu S., Diker F., Altintas A., Ozaydin F.
Acta Physica Polonica A
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2015
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vol. 127
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issue 4
1230-1232
EN
In order to create polarization based entanglement networks of W₄ state, we propose an optical setup, which uses only four horizontally polarized photons as resource which implies no entanglement requirement as a resource. This setup can generate target state deterministically, by operating several quantum optical gates, which can be realized with current photonics technology. The setup we propose is composed of one Not, two Hadamard, five Controlled Not (CNot) and one Toffoli gate.
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