منابع مشابه
Optimal universal and state-dependent quantum cloning
We establish the best possible approximation to a perfect quantum cloning machine which produces two clones out of a single input. We analyze both universal and state-dependent cloners. The maximal fidelity of cloning is shown to be 5/6 for universal cloners. It can be achieved either by a special unitary evolution or by a novel teleportation scheme. We construct the optimal state-dependent clo...
متن کاملStrategies and Networks for State-Dependent Quantum Cloning
The no-cloning theorem of Wootters, Zurek [1] and Dieks [2] shows that it is impossible to devise a means of perfectly replicating an arbitrary, unknown quantum state. While such an ideal cloning machine cannot be constructed, this important result does not prohibit cloning strategies which have a limited degree of success. Numerous interesting contributions have been made to this subject by ma...
متن کاملCapacity Bounds for State-Dependent Broadcast Channels
In this paper, we derive information-theoretic performance limits for three classes of two-user state-dependent discrete memoryless broadcast channels, with noncausal side-information at the encoder. The first class of channels comprises a sender broadcasting two independent messages to two non-cooperating receivers; for channels of the second class, each receiver is given the message it need n...
متن کاملAsymptotic quantum cloning is state estimation.
The impossibility of perfect cloning and state estimation are two fundamental results in quantum mechanics. It has been conjectured that quantum cloning becomes equivalent to state estimation in the asymptotic regime where the number of clones tends to infinity. We prove this conjecture using two known results of quantum information theory: the monogamy of quantum correlations and the propertie...
متن کاملQuantum Feedback Control Using Quantum Cloning and State Recognition
A scheme of quantum feedback control with an optimal cloning machine is proposed. The design of quantum feedback control algorithms is separated into a state recognition strategy, which gives “on-off” signal to the actuator through recognizing some copies from cloning machine, and a feedback (control) strategy through feeding back the another copies of cloning machine. Precise feedback is aband...
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: 2002
ISSN: 1050-2947,1094-1622
DOI: 10.1103/physreva.66.052301