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Quantum Computer

01 /Quantum Computers 02 /How to build a qubit 03 /Spin qubits (beginner level) 04 /Operations on spin qubits (beginner level) 05 /Electron spin qubits 06 /Capturing a single electron 07 /Quantum dot qubits 08 /Quantum control and readout 09 /Qubit errors 10 /NV center qubits 11 /Operations on NV center qubits 12 /The Transmon Qubit - A basis for the Quantum Computer 13 /Operations on the Transmon Qubit - Circuit QED 14 /Single-qubit operations on the Transmon qubit 15 /Measurements on the Transmon Qubit 16 /Two-qubit operations on the Transmon qubit 17 /Topological qubits: Anyons 18 /Operations on anyons: Braiding 19 /Operations on anyons: Real-life experiments 20 /Topological quantum computing: Majorana fermions and where to find them 21 /Majorana bound states in superconductors 22 /How do you measure Majorana bound states? 23 /A framework for the future Quantum Computer 24 /The Building Blocks of a Quantum Computer 25 /How to build a Quantum Algorithm - Quantum Circuits 26 /How do you program a quantum algorithm? 27 /The compiler of a quantum computer 28 /Micro-architectures 29 /How do we connect our quantum system to a classical interface? 30 /Assembling a Quantum Processor 31 /Microwave drivers for qubits 32 /Implementation of microwave drivers 33 /Quantum error correction 34 /Surface codes 35 /Fault-tolerant Quantum Error Correction with surface codes

Qubit errors

So far we have seen how qubits can be realized in physical systems, and in what ways we can control them. We will now shift our focus to the kinds of errors that can occur and how to characterize them. In this video, Menno Veldhorst (QuTech) will explain relaxation and dephasing.

Prerequisite knowledge

Further Thinking 

Which effect is more dominant in spin qubits: phase loss or energy loss?

Do we need to prepare a superposition state in a T1 experiment?

Solution

Further reading 

For a quantitative example of decoherence time see section “Relaxation and decoherence” here https://physicstoday.scitation.org/doi/full/10.1063/PT.3.4270

An example of more sophisticated pulse schemes can be found in https://science.sciencemag.org/content/336/6078/202