main

2019/01/25

three types of quantum computer



  1. Analog quantum computer (quantum annealer, adiabatic QC, direct quantum simulation) examples: D-wave
  2. Noisy intermediate-scale quantum (NISQ) gate-based computer  
    1. example: IBM quantum computer
  3. Fully error-corrected gate-based quantum computers
    1. not available yet


Two leading technologies for quantum computing—trapped ions and superconducting qubits—use very different strategies for embodying and operating on qubits. 

2019/01/24

quantum computer difficuty

There are many technical challenges:

1) quits cannot intrinsically reject noise

2) error free quantum computer requires quantum error correction


3) large data inputs cannot be loaded into a quantum computer efficiently.


4) Quantum Computers Will Need a New Software Stack


5) The Intermediate State of a Quantum Computer Cannot Be Measured Directly


From "Quantum Computing: Progress and Prospects (2018)" by National Academies Press. The pdf file is http://nap.edu/25196

2018/10/12

human perception

  1. This is analogous to the way humans and animals perceive the world: after observ- ing a scene for a few seconds, a human can remember which abstract objects were present in it (bicycle, tree) but can’t remember the specific appearance of these objects. In fact, if you tried to draw a generic bicycle from memory, chances are you couldn’t get it even remotely right, even though you’ve seen thousands of bicycles in your lifetime (see, for example, figure 5.28). Try it right now: this effect is absolutely real. You brain has learned to completely abstract its visual input—to transform it into high-level visual concepts while filtering out irrelevant visual details—making it tre- mendously difficult to remember how things around you look.

    From "Deep Learning with Python"

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