Save 0 and 1 at the same time

New building blocks for the quantum computer

Regardless of each other in the science magazine Nature, two groups of physicists via logical quantum gates using ion traps.

Image: Universitat Innsbruck

In classic computers, information units in the form of bits, ie 0 or 1, stored. The linking of these bits allows the calculation occurrence. Quantum Computer, on the other hand, are the dream of computer feed, because with them it is much more efficient, as the so-called quantum bits (qubits) can be present in surveys from O and 1. Theoretically, this has been predicted, the question was so far only how that practically implement.

Now two research groups have done important steps towards the quantum computer and both control the shortened state of atoms in ion traps.

It had already become clear in the youngest past that ion pairs could be suitable building blocks. In January, a team of UNI Innsbruck with such an apparatus in which ions can be captured in an electromagnetic field and manipulated by laser pulses, a simple arithmetic operation (cf. Ion traps as building blocks). The atoms are ionized to keep them fiscal free in vacuo. Thanks to high-priced laser light pulses, the atoms are then turned on and off, so to speak.

Logical gate, in English "Quantum Controlled Not" or short CNOT, correspond to the XOR gate of the existing computers, ie the switch, which over the either or, or or. O or 1 decides. These essential elements are fundamental for the calculation of the system, the logical operations (cf. Quantal logic).

The team from ten experimental physicists around Ferdinand Schmidt-Kaler from the University Innsbruck oriented in their experiment at a theoretical proposal, the prof. Peter ZOLLER and PROF. Ignacio Cirac had made in 1995 for the use of ion traps (cf. Quantum computer). The group used calcium ions that can be individually manipulated by the focused laser. The scientists.

In order to maintain the atoms with the help of electric fields virtually completely fidelity-free in vacuo, they are ionized so that they are electrically charged. (…) However, the special interest of the atoms, in which they do not really save 0 or 1, but some materials both the bits simultaneously. Even unreal will seem to us of two quantum bits, in which we do not know about each individual bit, whether it has the status 0 or 1, but are sure that both quantum bits carry the same information. The Easter Nobel Peabridge Erwin Schrodinger had already interpreted the concept of suspension 75 years ago. Due to the successful work of the Innsbruck physicists is now the way free, this state of nature, which may be conflicted most with our daily understanding, exactly. The importance of this success comes the construction of the first silicon transistor for the incomable computer technology.

D. Leibfried from the National Institute of Standards and Technology in Boulder, Colorado and eleven colleagues developed by the University of Colorado and the English University of Oxford and realized another new technology. They built a resistive 2-qubit quantum gate with prisoners beryllium atoms. Your geometric system is particularly robust, D.H. The qubits are particularly resistant to the existing threat of decoharency, the decay of quantum condition (cf. Basic idea of decoharency).

In his accompanying NewsViews-Item notes Andrew Steane from the University of Oxford that these new quantum gates are very promising in their precision and probably can be expanded to the level of use of many qubits:

Both publications prove the remarkable progress of what the essence of quantum computers is: a controlled manipulation of suspension.

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