ar X iv : q ua nt - p h / 03 10 19 3 v 2 9 Ju n 20 04 A size criterion for macroscopic superposition states
نویسنده
چکیده
An operational measure to quantify the sizes of some “macroscopic quantum superpositions”, realized in recent experiments, is proposed. The measure is based on the fact that a superposition presents greater sensitivity in interferometric applications than its superposed constituent states. This enhanced sensitivity, or “interference utility”, may then be used as a size criterion among superpositions.
منابع مشابه
ar X iv : q ua nt - p h / 06 03 00 8 v 2 2 1 Ju n 20 06 ON POSITIVE DECOMPOSABLE MAPS
A partial characterization (a necessary condition for decompos-ability and a criterion for nondecomposability) of decomposable positive maps is given. Furthermore, a clarification of the structure of the set of positive maps is provided.
متن کاملar X iv : q ua nt - p h / 04 02 03 5 v 3 9 Ju n 20 05 p - MECHANICS AND FIELD THEORY VLADIMIR
The orbit method of Kirillov is used to derive the p-mechanical brackets [25]. They generate the quantum (Moyal) and classical (Poisson) brackets on respective orbits corresponding to representations of the Heisenberg group. The extension of p-mechanics to field theory is made through the De Donder–Weyl Hamiltonian formulation. The principal step is the substitution of the Heisenberg group with...
متن کاملar X iv : q ua nt - p h / 04 06 02 4 v 1 3 Ju n 20 04 Measurement of an integral of a classical field with a single quantum particle
A method for measuring an integral of a classical field via local interaction of a single quantum particle in a superposition of 2 states is presented. The method is as efficient as a quantum method with N qubits passing through the field one at a time and it is exponentially better than any known classical method that uses N bits passing through the field one at a time. A related method for se...
متن کاملar X iv : q ua nt - p h / 03 04 10 7 v 1 1 5 A pr 2 00 3 Distillable entanglement in d ⊗ d dimension
Distillable entanglement (E d) is one of the acceptable measures of entanglement of mixed states. Based on discrimination through local operation and classical communication, this paper gives E d for two classes of orthogonal multipartite maximally entangled states.
متن کاملar X iv : q ua nt - p h / 03 04 09 0 v 4 1 9 Ju n 20 06 HIDDEN SYMMETRY DETECTION ON A QUANTUM COMPUTER
The fastest quantum algorithms (for the solution of classical computational tasks) known so far are basically variations of the hidden subgroup problem with f (U [x]) = f (x). Following a discussion regarding which tasks might be solved efficiently by quantum computers, it will be demonstrated by means of a simple example, that the detection of more general hidden (two-point) symmetries V {f (x...
متن کامل