相关论文: Perfect cloning of harmonic oscillator coherent st…
This paper has been withdrawn by the author due to a crucial error in one of equation in (3).
This paper has been withdrawn.
We propose a feasible scheme to implement the 1-to-2 optimal cloning transformation for two pairs of orthogonal states of two-dimensional quantum systems in the context of cavity QED. The copied qubits are shown to be inseparable by using…
The celebrated quantum no-cloning theorem states that an arbitrary quantum state cannot be cloned perfectly. This raises questions about cloning of classical states, which have also attracted attention. Here, we present a physical approach…
This paper has been withdrawn by the authors due to the paper is far from complishment.
We consider cloning transformations of equatorial qubits and qutrits, with the transformation covariant for rotation of the phases. The optimal cloning maps are derived without simplifying assumptions from first principles, for any number…
This paper has been withdrawn by the authors due to a problem with *efficiently* predicting the large fourier coefficients. It is being reworked and will be resubmitted in the near future.
This paper has been withdrawn. A more satisfactory account of the results it was supposed to present will appear in a series of papers starting with hep-th/9712256 and hep-th/9712258
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…
We construct a new class of coherent states indexed by points z of the complex plane and depending on two positive parameters m and epsilon by replacing the coefficients of the canonical coherent states by polyanalytic functions. These…
This paper has been withdrawn by the author due to an error estimate in Lemma 3.1.
This paper has been withdrawn by the authors due to an error first noted by M. Lukin.
Here we report an experimental realization of optimal phase-covariant quantum cloning machine with a single electron spin in solid state system at room temperature. The involved three states of two logic qubits are encoded physically in…
This paper has been withdrawn by the author due to a crucial sign error in equation 1
This paper has been withdrawn
This paper has been withdrawn by the author due to an error in the derivation.
This paper has been withdrawn due to security loophole. We thank Dr G. P. he for pointing this to us.
The paper is withdrawn because the analysis appeared to be incomplete.
The purposes of this work are (1) to show that the appropriate generalizations of the oscillator algebra permit the construction of a wide set of nonlinear coherent states in unified form; and (2) to clarify the likely contradiction between…
This paper has been withdrawn. See quant-ph/9806031 for a discussion.