Researchers demonstrated a Gaussian boson sampling system based on “beam splitters”. Beam splitters take the incoming photon stream from the laser beam and split it into two streams moving in different directions. Essentially, the system
is a linear optical quantum computer from a network of beamsplitters.
Beam splitter at 45 degree angle can be considered as a four-port device. If two identical photons hit the same beam splitter from two different ports, then both will come out of the same port. The paths of the photons become entangled. If a sufficiently large network of beamsplitters is constructed, then branched entangled states arise. The number of output states scales quickly with the number of inputs and beamsplitters.
In the current demo, the researchers used 50 inputs and a chip with the equivalent of 300 beamsplitters. The total number of possible output states is about 1030.
In less than four minutes, the researchers obtained results that would take a fast classical computer about 2.5 billion years to calculate.
This was followed by rigorous tests to ensure that the behavior of the system was indeed quantum. If you calculate what will happen to specific input states and compare the output states with the results of those calculations, then the measurement results match the predictions. It is also possible to calculate the power output of the network if the light is not in a quantum state or if the photons are not identical and these measurements do not match predictions. This convincingly proves that the result is due to quantum effects.
One laser emits 25 beams of the same intensity, each of which is associated with two crystals, and the crystals generate single photons. The crystals are connected to optical fibers, the outputs of which are connected to a microcircuit where the beam splitters are located. Fiber outputs must be aligned with photodetectors. The entire installation covers an area of about 1.5 x 2.5 m and must be stabilized with high accuracy (about 10 nm).
At the moment, quantum computers are composed of a chain of ions. The ions are spaced far enough apart that they can be accessed separately, which means that information (in the form of quantum bits or qubits) can be stored and read from individual atoms. Computational operations can be performed using microwaves and ion movement. Another variant of the architecture of quantum computers is superconducting rings cooled by liquid helium.
Each ring is a qubit that is connected to the others through wires. The advantage of this approach is that the hardware is relatively easy to scale. But the quantum behavior of each qubit is much easier to break.
In contrast to both of these options, an optical quantum computer can be a chip-scale device that is powered by an array of laser diodes, read out by a series of single-photon detectors. None of them require ultra-low temperatures or vacuum (if photon counting detectors are required, liquid nitrogen can be used). Optical quantum computing requires thermal stability and a fairly sophisticated feedback system to get the lasers to work exactly as they want them to.
Which manufacturers update the OS on smartphones the fastest: Android version 11
Google released the stable version of the Android 11 operating system on September 8, 2020. Very soon, the platform celebrated...
Nubia Red Magic 6 is the world’s first smartphone with Snapdragon 888 and 500 Hz screen
Nubia Technology CEO Ni Fei continues to fuel interest in the gamer-focused Nubia Red Magic 6 and Red Magic 6...
Meizu is not going to inflate the Meizu 18 lineup
The line of flagship smartphones Samsung Galaxu S21 – three models, Xiaomi is preparing to complement the Mi 11 with...
Samsung Galaxy Tab S7 Lite cannot boast of the performance of its older brothers. It is built on Snapdragon 765G
The first details about the Samsung Galaxy Tab S7 Lite tablet appeared ten days ago, and now a promising novelty...
5nm, 96 cores, 192 threads and 12 channels of DDR5 memory. Characteristics of the most powerful AMD processors, which will be presented in the fall
While the whole world is waiting for AMD Milan server processors based on Zen 3 architecture, AMD is already working...
iPhone 12 finally jailbroken: jailbreak for iOS 14 released with support for all models from iPhone 6s
A team of experienced Apple mobile platform hackers Unc0ver has released a jailbreak that works on iOS 14 to 14.3...
All parameters of the ten latest Intel Rocket Lake processors. It remains to find out about the Core i5
There is almost a month before the official start of sales of Intel Rocket Lake processors, and the announcement should...
Many new Trojans for Android found on Google Play
Cybersecurity company Doctor Web published a report on malicious activity for mobile devices in January 2021. And although the total...
- Phones6 days ago
Gartner analysts recorded a 12.5% decline in the smartphone market
- Headphones7 days ago
The Sony WF-1000XM4 wireless headphones are finally getting more compact. The first image appeared
- News2 days ago
Perseverance sent the first panorama of Mars in huge resolution and 5600 photos
- News6 days ago
Real Mars Sounds and Perseverance Rover Landing Videos
- Components7 days ago
The cheapest among the new Intel processors is inferior to the cheapest new product from AMD. Core i5-11400 performed well in the test
- Components6 days ago
The eight-core Core i7-11700 may be more attractive than the Ryzen 7 5800X. The first volumetric test of the new Intel appeared
- News7 days ago
Tens of thousands of Macs around the world are infected with unknown malware
- News5 days ago
Original wallpaper with Huawei Mate X2 in high resolution
- Phones6 days ago
A slice of Xiaomi Mi 11 Ultra: Samsung unveils an image sensor for the new king of mobile photography
- News6 days ago
Bitcoin price dropped to $ 47,780 in the last 24 hours
- Electric Cars7 days ago
Tesla stops selling the most affordable version of the Model Y electric car a month after its release
- Components5 days ago
The first Huawei monitor came out in Europe