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Re: Light-based quantum computers will come at a great cost

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Sam Wormley <swormley1@gmail.com> wrote:
> Light-based quantum computers will come at a great cost
>> http://physicsworld.com/cws/article/news/2015/oct/26/light-based-quantum-computers-will-come-at-a-great-cost
> 
>> About 100 billion optical components would be needed to create a
>> practical quantum computer that uses light to process information.
>> That is the conclusion of physicists in the UK, who have calculated
>> how many components are required to make a fault-tolerant linear
>> optical computer. Their comprehensive study found that the total
>> number of required components for a photon-based computer would be at
>> least five orders of magnitude larger than for a matter-based
>> processor.
>>
>> Unlike the components of conventional computers ? which are extremely
>> reliable ? quantum logic devices are prone to failure. This is
>> because the entities used to store and transmit information ? quantum
>> bits (qubits) ? quickly lose their quantum nature when in contact
>> with the outside world. Ion-based qubits, for example, must be kept
>> in ultrahigh-vacuum conditions to minimize their contact with air
>> molecules. One way of dealing with this fragility is to create a
>> fault-tolerant quantum computer, in which a single "logical qubit" is
>> distributed across a number of different "physical qubits" ? the
>> latter being ions, superconducting circuits or photons. The idea is
>> that if one or more physical qubits fail, then the logical qubit can
>> be recovered and the calculation can continue.

Summary: Quantum computers are unlikely to ever become real.



-- 
Jim Pennino

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Light-based quantum computers will come at a great cost Sam Wormley <swormley1@gmail.com> - 2015-10-29 16:30 -0500
  Re: Light-based quantum computers will come at a great cost jimp@specsol.spam.sux.com - 2015-10-29 21:43 +0000
    Re: Light-based quantum computers will come at a great cost xxein1@att.net - 2015-10-29 18:16 -0700
  Re: Light-based quantum computers will come at a great cost Bobby Sifuentes <bobsif@academicinstitute.org> - 2015-10-29 21:46 +0000
    Re: Light-based quantum computers will come at a great cost john <johnsefton288@gmail.com> - 2015-10-29 15:21 -0700
      Re: Light-based quantum computers will come at a great cost xxein1@att.net - 2015-10-29 18:23 -0700
    Re: Light-based quantum computers will come at a great cost xxein1@att.net - 2015-10-29 18:18 -0700
  Re: Light-based quantum computers will come at a great cost xxein1@att.net - 2015-10-29 18:10 -0700
  Re: Light-based quantum computers will come at a great cost "reber g=emc^2" <herbertglazier0@gmail.com> - 2015-10-30 12:58 -0700

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