2021-11-30

Stanford team introduced that the photonic quantum computer with simplified structure can easily realize performance expansion

By yqqlm yqqlm

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bd89bcc123f5f9e - Stanford team introduced that the photonic quantum computer with simplified structure can easily realize performance expansion

thanks to the wonderful properties of quantum physics, quantum computers can perform much faster calculations than traditional computers. Moreover, in the storage and processing of information, traditional computers only have “0” and “1”, but quantum computers can also give consideration to both

this means that the computing power of quantum computers will increase exponentially with the increase of qubits, so that they can solve many problems that cannot be solved by classical computers

Stanford team introduced that the photonic quantum computer with simplified structure can easily realize performance expansion

at the same time, quantum computers are also facing great challenges. On the one hand, the quantum effect on which quantum computers operate is very sensitive to interference such as vibration or heat, so we can only strive to maintain it in an environment close to absolute zero at this stage

on the other hand, the complexity of quantum computers will increase sharply with the expansion of machine computing power, resulting in their larger and more bulky physical size

Stanford team introduced that the photonic quantum computer with simplified structure can easily realize performance expansion(1)

the good news is that the Stanford team says their new design is quite simple. And as a photonic circuit, it can be built using some ready-made components – including an optical cable, a beam splitter, two optical switches, and an optical cavity

in this way, this design can reduce the number of physical logic gates required by quantum computers. “Usually, if you want to build this type of computer, you often need to use thousands of quantum emitters and integrate them into a huge photonic circuit,” said Ben Bartlett

the new scheme of Stanford Research Team only needs some relatively simple components, and the machine size will not increase with the size of quantum programs to be run

Stanford team introduced that the photonic quantum computer with simplified structure can easily realize performance expansion(2)

as shown in the figure, the new design is mainly composed of two parts. One is the ring and scattering unit for storing photons. Photons represent qubits and determine the state of “0” or “1” by the direction of traveling around the ring. If the photon travels in both directions at the same time, it indicates that the photon presents a quantum superposition state

in order to encode photon information, the system can guide them out of the ring, into the scattering unit, and then into the cavity containing a single atom. When photons interact with atoms, they become entangled

in this quantum state, the two particles can no longer be described separately. Changes made to a particle affect the particle with which it is paired, no matter how far apart they are

Stanford team introduced that the photonic quantum computer with simplified structure can easily realize performance expansion(3)

photon quantum computer dynamic diagram (15s video via)

after the photon returns to the storage ring, the device can also manipulate the atom through the laser to complete the “write” operation. The team points out that an atom can be reset and reused, and they can manipulate many different photons in a ring

this means that the computing power of quantum computers can be expanded by adding more photons to the ring, rather than recklessly equipped with more rings and scattering units

more importantly, this system should be able to run various quantum operations. By writing new code to change the way and time atoms interact with photons, you can run different programs on the same circuit

Stanford team introduced that the photonic quantum computer with simplified structure can easily realize performance expansion(4)

Ben Bartlett added: “by measuring the state of atoms, you can transfer the operation to photons. Therefore, we only need a controllable atomic qubit and use it as a proxy to indirectly manipulate all other photon qubits”

for many photon quantum computers, the gate is the physical structure through which photons pass. At this point, if you want to change the running program, you usually need to reconfigure the hardware

under Stanford’s new scheme, you don’t need to change the hardware – just pass a different set of instructions to the machine. Even better, quantum computer systems can operate at room temperature, eliminating the need for extremely large cooling systems