qsimulatR (version 1.1.1)

measure: Method measure

Description

performs a masurement on a qstate object.

Usage

measure(e1, bit = NA, repetitions = NA)
# S4 method for qstate
measure(e1, bit = NA, repetitions = 1)

Value

measure(e1, bit, repetitions) returns a list with the measured bit, the number of repetitions, the probability distribution of all states prob and the results vector value. If all bits are measured, the basis is added to the list as basis. The collapsed state is stored as psi if exactly one measurement is performed. In the case of a single qubit measurement value is of length repetitions

and contains all the results of this projection. Otherwise value is of length 2^nbits and it contains the counts how often each state has been obtained.

Arguments

e1

object to measure

bit

bit to project on

repetitions

number of measurements

Details

measure(e1, bit, repetitions) performs repetitions many projections/measurements of the qubit bit. If bit is not given explicitly, all qubits are projected.

Examples

## measure the separate bits
x <- H(1) * (H(2) * qstate(nbits=2))
summary(measure(x, bit=1))
hist(measure(x, rep=100))