Gil is even critical of the use of vocabulary The word supremacy implied that quantum comput ers were always better than supercomputers and will completely displace them That however is exactly not the case says Gil s German colleague Ingolf Wittmann who drives quantum computing in Europe Instead quantum computers and con ventional supercomputers will be sharing jobs in the future Qubits instead of bits Quantum computers will only be used where con ventional supercomputers reach their limits the expert explains For instance in the fi eld of chem istry The composition of the caff eine molecule is not particularly complicated and has 95 elec trons However if you wanted to calculate its exact binding energy you d need more classical bits than atoms exist in the universe A quantum computer with 160 quantum bits abbreviated as qubits would be able to solve this problem according to Wittmann s assessment The massive diff erence in computing power is that qubits function in a com pletely diff erent way than normal bits While the lat ter can always just assume the two values of 0 or 1 an intermediate state exists for qubits which means that the qubit can represent both values at the same time However the whole thing only be comes really exciting when several qubits are com bined which physicists refer to as entanglement Performance grows exponentially If two entangled qubits simultaneously contain four states this means eight states with three 77 Outlook

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