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Suppose you are given an n-qubit quantum channel defined as ε(ρ) = iΣ Π Xi ρ Xit , where Xi denotes an n-fold tensor product of Pauli matrices and {Pi} is a probability distribution. The Holevo-Schumacher-Westmoreland capacity of the channel is defined by χ(ε) = {qj, pj}max [S (jΣ qjpj) - jΣ qj S (pj)], where S denotes the von Neumann entropy of a density matrix. Is it known how to calculate this number as a function of pi and n?
person 1.6 m tall stands 5.2 m from a reflecting globe in a garden. How large is the person's image
A farm truck moves due north with a constant velocity of 9.5 m/s on a limitless horizontal stretch of road. A boy riding on the back of the truck throws a can of soda upward and catches the projectile at same location on the truck bed, but 16 m fa..
a uniform electric field of magnitude 430 nc pointing in the positive x-direction acts on an electron which is
A piano string with a length of 1.15-m and a mass of 20.0-g isunder a tension of 6.30×10^3 N. What are the frequencies of the next two harmonics
The heels on a pair of women's shoes have radii of 0.5 cm at the bottom. If 30% of the weight of a woman weighing 480 N is supported by each heel, find the stress on each heel
Find the capacitance of a parallel plate capacitor having plates of area 7.00 m2 that are separated by 0.100 mm of Teflon
A 0.22-kg stone is held 1.2 m above the top edge of a water well and then dropped into it. The well has a depth of 5.1 m. (a) Relative to the configuration with the stone at the top edge of the well, what is the gravitational potential energy of th..
What is the ratio of the dynamic viscosity of air to that of water at standard pressure and a temperature of 20?C? Find the ratio of the kinematic viscosity of air to that of water for the same condition?
Consider a capacitor C being discharged through a resistor R as shown in figure a. The initial potential difference across the capacitor is 24.0 V, Compute the initial charge and time constant
The speed of light in vacuum is186,000 mi/s = 3.00 × 108 m/s . Use this fact to find the number of kilometers in a mile. A rectangular prism has the following dimensions: 11= 45.0 cm, 12= 105cm, 13= 48.0 cm. What is its volume in cm3? What is its vol..
In a particular Millikan oil-drop apparatus, the plates are 2.25 centimeter apart. Find what strength of electric field is needed to hold such a drop stationary against gravity if the drop contains five excess electrons
twelve identical point charges q are equally spaced around the circumference of a circle of radius r. the circle is
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