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Toward more accurate single qubit measurement #20

Closed itoko closed 4 years ago

itoko commented 4 years ago

Abstract

Answering this question is our goal: How accurately can we measure a qubit? At pulse level, when measuring a qubit, we apply measurement pulse to the qubit and acquire the response to distinguish the state of qubit (|0> or |1>). Usually, IBM Q systems measure all of the qubits at once, that means measurement pulses are applied to all the qubits. How much is the measurement result of a qubit affected by the measurement pulses applied to the other qubits? We conduct experiments to reveal the difference, and think further about the way of measuring a qubit as accurate as possible.

Description

We design and conduct experiments using the pulse module in Qiskit Terra:

In "Adding measurements to Schedules" section, we can see how to tweak measurements in the pulse schedule to be executed.

First, we will compare the results of two schedules:

  1. Play measurement pulses to both of q0 and q1 and Acquire both of q0 and q1
  2. Play measurement pulses to either of q0 and q1 and Acquire both of q0 and q1

In this way, we can see how the measurement pulse on the other qubit affects a qubit of interest.

Members

Deliverable

A jupyter notebook.

GitHub repo

A link to a repo.

PhysicsQoo commented 4 years ago

Hello I want to join

HuangCheChun commented 4 years ago

I want to join in this group.

JoeJhan commented 4 years ago

Hi ltoko, there are several NTU mentors and we are all interested in this issue. Maybe we can discuss further about this issue and cooperate with you even though we don't need to present at Hackathon end.

MengChienWang commented 4 years ago

I want to join in this group.

starktech23 commented 4 years ago

Hi ltoko, there are several NTU mentors and we are all interested in this issue. Maybe we can discuss further about this issue and cooperate with you even though we don't need to present at Hackathon end.

@itoko

itoko commented 4 years ago

@qoohehe @MengChienWang @HuangCheChun Welcome! If you have any question on this project, please ask me via slack (my Slack name is @itoko-san). Enjoy!

nkanazawa1989 commented 4 years ago

Advanced: It's also interesting to see the impact of measurement of superposition state on neighboring qubits (especially it's also in the superposition state). Because physically interconnected qubits are coupled by static ZZ interaction, the collapse of superposition state may induce phase accumulation of neighboring qubits.

veenaiyuri commented 4 years ago

This issue will be closed to be discussed after the hackathon for potential collaboration.