A slightly longer answer more or less equivalent to Mr. Muskrat's reply in a somewhat more programmatic way.

Note that the module has "save_state" and "restore_state" methods. So you can do:

my $die = entangle( 1=>1, 1=>2, 1=>3, 1=>4, 1=>5, 1=>6 );
my $save_state = $die->save_state;
for (1..5) {
    print "$die ";
    $die = $save_state->restore_state;
}
# print: "2 1 3 2 5" or whatever
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And observe that (of course, the "observation" below will be different each time):

#!/usr/bin/perl -w
use Quantum::Entanglement;
my $die = entangle( 1=>1, 1=>2, 1=>3, 1=>4, 1=>5, 1=>6 );
print "Pre-observation:  ".$die->show_states;
print "Observation:        $die\n";
print "Post-observation: ".$die->show_states;
# print:
# 
# Pre-observation:  1|1>    1|2>    1|3>    1|4>    1|5>    1|6>
# Observation:        3
# Post-observation: 1|3>
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To see how/why the module collapsed the states (besides being philosophically compliant with quantum mechanics), you could use the Aspect module to track call flow:

#!/usr/bin/perl -w
use strict;
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
use Aspect qw(advice calls returns around) ;
my $aspect = advice(
        calls(qr/^(Quantum|main)::(.*)/), 
          sub { printf "calling -> %s\n", $::thisjp->sub }
      );
$aspect->enable;
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
use Quantum::Entanglement;
sub foo {
    my $die = entangle( 1=>1, 1=>2, 1=>3, 1=>4, 1=>5, 1=>6 );
    print $die ; print "\n" ;
}

foo();

# print:
# 
# calling -> main::foo
# calling -> main::entangle
# calling -> Quantum::Entanglement::_new
# calling -> Quantum::Entanglement::(""
# calling -> Quantum::Entanglement::_normalise
# 5
# calling -> Quantum::Entanglement::DESTROY
# calling -> Quantum::Entanglement::_rationalise_states
# calling -> Quantum::Entanglement::_unravel
# foo();
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The ("" thing is (I assume) the double-quote operator, which is overloaded by "str_ent" method in the module (which in turn called "_normalise" ). In str_ent, there is a comment that says:

# set all non retained states to zero probability, leave others alone
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So, I guess, each time you print $die, double-quote operator will be used, which uses str_end, which always collapses the states.