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Fundamentals Solutions

01 /Quantum computers with magical advantage? 02 /Bra-ket notation 03 /Born rule 04 /Bloch sphere 05 /Measurement operators 06 /Experimental and theoretical measurements 07 /How to measure in any basis 08 /State decomposition 09 /Why every maximally entangled state is secretly a Bell state 10 /Coherence 11 /Relaxation 12 /Quantum materials: the environment of a qubit 13 /Introduction to quantum error correction (QEC) 14 /Multiqubit systems 15 /Multiqubit gates 16 /Entanglement 17 /Measuring multiqubit systems 18 /Superdense coding 19 /Teleportation 20 /Entanglement swapping

Quantum materials: the environment of a qubit

What do you think are necessary properties that a quantum computer should have?

The properties a quantum computer should have are given by are the DiVincenzo criteria:

  • The system must be scalable with well-defined qubits;
  • The computer must have the ability to initialize the state of qubits;
  • Qubits must have long decoherence times;
  • The computer must be able to perform a universal set of quantum gates on the qubits;
  • It should be possible to measure the qubits.

We have to keep these criteria in mind when we choose the material for our qubits. For example, having homogeneous materials makes it possible to scale the system easily.

Which property should the material have to ensure long decoherence times?

The correct answer is:

A. Use materials with low density where qubits can easily be accessed for error correction.