Quantum Computing Breakthrough Promises Ease of Managing Qubits

A new breakthrough might open the door wide open for the rapid development of quantum computing.  The breakthrough could lead to solving one major problem of quantum computing development, managing what are called qubits.  A new technique might make managing the complex algorithms of these qubits a whole lot easier.

Here is the definition of qubits in Wikipedia:
In quantum computing, a qubit (/ˈkjuːbɪt/) or quantum bit (sometimes qbit) is a unit of quantum information—the quantum analogue of the classical bit. A qubit is a two-state quantum-mechanical system, such as the polarization of a single photon: here the two states are vertical polarization and horizontal polarization.

from sciencedaily.com

Future quantum computers promise exponential scaling in computing power with linearly increasing number of qubits. However, harnessing this power is challenging due to the complexity of controlling a large number of qubits simultaneously. A solution to this problem has been engineered by Richard Versluis, principal scientist at TNO, Leo DiCarlo, associate professor at TU Delft and postdoc Stefano Poletto with support of colleagues from TNO and TU Delft at QuTech and Intel. They invented a control methodology for fault-tolerant quantum computing based on a basic building block of eight qubits with a fixed set of control hardware. This basic building block can be reproduced to large arrays of qubits, without any increase or changes to the control hardware.

With this new method, qubit error correction and logical operations, needed to execute complex algorithms on large scale quantum computers, are now made possible on any number of qubits….

…..Large-scale quantum computers require smart hardware

A major challenge for quantum computers, which now consist of a handful of qubits, is their scalability. In order to execute quantum algorithms with a reasonable success rate, you need millions of qubits in order to overcome the inherent instability of qubits and correct errors in the system. Up to now, qubit control systems typically got bigger and more complex with the growing number of qubits. This is not a major problem in experimental quantum chips with a small number of qubits, but no concepts were available to control the thousands to millions of qubits, while at the same time performing error correction on the qubits.

Any number of qubits controlled by a single set of hardware

The researchers from QuTech, a collaboration founded by TU Delft and TNO, established a solution to this scaling challenge for superconducting qubits. The solution uses control hardware with the size of a small bookcase, to control a basic set of eight qubits. By copying and pasting the eight qubits on the chip, the same single control system can control any number of qubits individually, from 8 to 8 million or more, and execute the gates required for quantum error correction. This enables quantum computer programmers to execute quantum algorithms on any number of qubits. The next goal at QuTech is to apply this method to realize a 17-qubit quantum processor with error correction in an ongoing project. This would constitute a world-record number of qubits with both individual control and error correction.

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