Commit a1bbf171 authored by Nguyen, Thien Minh's avatar Nguyen, Thien Minh
Browse files

forgot to shift the gauge position for measure 



Signed-off-by: default avatarThien Nguyen <nguyentm@ornl.gov>
parent dff88b81

tnqvm/visitors/itensor/mps/ITensorMPSVisitor.cpp

+2 −0
Original line number Diff line number Diff line
@@ -160,6 +160,8 @@ double ITensorMPSVisitor::compute_expectation_z( 
    const std::vector<size_t> &in_measureBits) {

  if (in_measureBits.size() == 1) {

    const auto site_idx = in_measureBits[0] + 1;

    // IMPORTTANT: shift the gauge position

    m_mps.position(site_idx);

    auto ket = m_mps(site_idx);

    auto bra = itensor::dag(itensor::prime(ket, "Site"));

    auto Z_op = singleQubitTensor(getSiteIndex(site_idx), Z(in_measureBits[0]));