Local distinguishability with preservation of entanglement
نویسندگان
چکیده
منابع مشابه
Mutual preservation of entanglement
Article history: Received 25 July 2012 Received in revised form 9 August 2012 Accepted 14 August 2012 Available online 20 August 2012 Communicated by P.R. Holland
متن کاملLocal distinguishability of multipartite unitary operations.
We show that any two different unitary operations acting on an arbitrary multipartite quantum system can be perfectly distinguished by local operations and classical communication when a finite number of runs is allowed. Intuitively, this result indicates that the lost identity of a nonlocal unitary operation can be recovered locally. No entanglement between distant parties is required.
متن کاملStatistical inference, distinguishability of quantum states, and quantum entanglement
We argue from the point of view of statistical inference that the quantum relative entropy is a good measure for distinguishing between two quantum states ~or two classes of quantum states! described by density matrices. We extend this notion to describe the amount of entanglement between two quantum systems from a statistical point of view. Our measure is independent of the number of entangled...
متن کاملLocal distinguishability of any three quantum states
We prove that any three linearly independent pure quantum states can always be locally distinguished with nonzero probability regardless of their dimension, entanglement or multipartite structure. Almost always, all three states can be unambiguously identified. The only exceptional case, where one state is locally knowable but the other two are not, is found among multi-qubit states. PACS numbe...
متن کاملLocal and global distinguishability in quantum interferometry.
A statistical distinguishability based on relative entropy characterizes the fitness of quantum states for phase estimation. This criterion is employed in the context of a Mach-Zehnder interferometer and used to interpolate between two regimes of local and global phase distinguishability. The scaling of distinguishability in these regimes with photon number is explored for various quantum state...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review A
سال: 2007
ISSN: 1050-2947,1094-1622
DOI: 10.1103/physreva.75.052313