Summary of Nanoscale refrigerator helps quantum computers keep their cool
This article discusses a breakthrough by Aalto University researchers who developed a nanoscale refrigerator to cool quantum computer components. Unlike classical bits, qubits exist in multiple states simultaneously but are highly sensitive to heat, which disrupts their delicate state required for accurate calculations. The team utilized quantum tunneling, where electrons pass through a 2-nanometer insulator barrier by drawing necessary energy from the device itself, thereby removing heat and stabilizing the system.
Parts used in the Nanoscale Refrigerator:
- Quantum tunneling mechanism
- Electrons
- 2-nanometer thick insulator
- Quantum device (qubits)
- Nanoscale refrigerator system
The next big breakthrough for electronics is likely to be quantum computers, which will increase digitized memory capacity exponentially and allow scientists to start tackling problems that our classical computers have no hope of handling right now. Companies like IBM are starting to make some headway, but there are still plenty of hurdles to jump before practical quantum computers become a reality. A team from Aalto University in Finland may have cleared one of those obstacles, developing a nanoscale refrigerator to help cool components down.
In a normal computer, information is stored as a bit, which can be either a one or a zero. But in the hard-to-fathom world of quantum computers, that information – a “qubit” – can assume the value of a one and a zero simultaneously. Storing information with chains of entangled qubits can exponentially increase the power of a computer system.
But before practical quantum computers can be developed, scientists essentially need to rebuild the whole system as we know it. Work is moving ahead on designing transistors, reprogrammable chips, data transfer methods and ways to stabilize the notoriously unstable quantum systems. The Aalto team has made a breakthrough in bringing another common computer component across to the quantum world: the cooling system.
Qubits are vulnerable to heat because it upsets the delicate state they must attain before they can be initialized to make accurate calculations. So the researchers set about finding a way to cool them down, to keep the system running smoothly.
Their approach makes use of quantum tunneling in which an electron can pass through a barrier thanks to the fact that it functions as both a particle and a wave. If there is an inducement for an electron to be on the other side of a barrier – such as more energy – it can, in a way, blink through the material to reach it. In this case, the researchers carefully gave the electrons slightly too little energy to directly tunnel through a 2-nanometer thick insulator. As a result, the electrons drew the energy they needed to complete the task from the quantum device itself. With that energy came a bit of heat, and this cooled the system down.
Read more: Nanoscale refrigerator helps quantum computers keep their cool
- What is the primary function of the new nanoscale refrigerator?
It cools quantum computer components to prevent heat from upsetting the delicate state of qubits. - How do qubits differ from normal computer bits?
While bits are either one or zero, qubits can assume the value of one and zero simultaneously. - Why is cooling essential for quantum computers?
Heat upsets the delicate state qubits must attain before they can be initialized for accurate calculations. - What physical phenomenon does the cooling system utilize?
The system makes use of quantum tunneling where an electron passes through a barrier acting as both a particle and a wave. - How did the researchers manipulate the electrons to achieve cooling?
They gave electrons slightly too little energy to directly tunnel, forcing them to draw energy from the quantum device itself. - What happens when electrons draw energy from the device?
The process removes a bit of heat from the system, effectively cooling it down. - Who developed this specific cooling technology?
A team from Aalto University in Finland developed the nanoscale refrigerator. - What is the thickness of the insulator used in the experiment?
The insulator used in the experiment was 2-nanometers thick.
