Physics – Quantum Physics
Scientific paper
2003-09-29
Physics
Quantum Physics
4 pages RevTeX, 6 figures in encapsulated postscript. Feedback welcome. v3: notation clarified, new circuit added with modulat
Scientific paper
In this paper we describe a set of circuits that can measure the concurrence
of a two qubit density matrix without requiring the deliberate addition of
noise. We then extend these methods to obtain a circuit to measure one type of
three qubit entanglement for pure states, namely the 3-tangle.
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