Hey folks, I have a pretty simple quantum information question that I was hoping somebody could answer.(adsbygoogle = window.adsbygoogle || []).push({});

let's say I have a pure state \ket{\psi} = \alpha \ket{10} + \beta \ket{11} + \gamma \ket{01} + \theta \ket{00}.

I then perform a measurement on only the first qubit and observe a value of 1. How do I now represent the state of my system? The temptation is to just renormalize the coefficients \alpha and \beta, but it's not clear to me whether this is correct or whether I have to use a density operator. Any advice would be awesome, this is a question that popped up while I was reading N and C for self-study. Thanks for your time!

**Physics Forums - The Fusion of Science and Community**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Simple Quantum Information Question

Loading...

Similar Threads - Simple Quantum Information | Date |
---|---|

A Simple way to create entangled photon pairs? | Jun 13, 2017 |

I Simple calc. of energy levels in quantum harmonic oscillator | Aug 2, 2016 |

Simple question about quantum entanglement from a layperson | Nov 19, 2015 |

The Physics of Consciousness by Dr. Evan Harris Walker | Jan 13, 2015 |

Simple question about matrix mechanics | Nov 7, 2014 |

**Physics Forums - The Fusion of Science and Community**