Data for Demonstration of a Quantum Switch in a Sagnac Configuration

# Data accompanying the paper"Demonstration of a Quantum Switch in a Sagnac Configuration" (arXiv:2211.12540v1).

"datastore_H.h5" and "datastore_P.h5" contain python/pandas dataframes holding coincidences counts aquired during the measurement.

"tomos.h5" cointains a python/pandas datafraframe holding the polarization tomography measurements on the individual polarization gadgets.

"read.py" gives an example of how to open the files.

The DataFrames "datastore_H.h5" and "datastore_P.h5" contain the following columns:

- **i, j**: indices of the implemented unitaries, as defined in the paper.
- **run**: index of repetition of the whole measurement.
- **cc_h_com**: integrated coincidences aquired in the H-port of the polarization tomography stage put after the commutator output port of the sagnac interferometer.
- **cc_v_com**: integrated coincidences aquired in the V-port of the polarization tomography stage put after the commutator output port of the sagnac interferometer.
- **cc_h_acom**: integrated coincidences aquired in the H-port of the polarization tomography stage put after the anticommutator output port of the sagnac interferometer.
- **cc_v_acom**: integrated coincidences aquired in the V-port of the polarization tomography stage put after the anticommutator output port of the sagnac interferometer.
- **cc_h_com_dark**: integrated dark coincidences aquired in this port.
- **cc_v_com_dark**: integrated dark coincidences aquired in this port.
- **cc_h_acom_dark**: integrated dark coincidences aquired in this port.
- **cc_v_acom_dark**: integrated dark coincidences aquired in this port.
- **triggers_com**: integrated number of trigger events leading to coincidences in the commutator port.
- **triggers_acom**: integrated number of trigger events leading to coincidences in the anticommutator port.  

"datastore_H.h5" holds data acquired using horizontally polarized input light.  
"datastore_P.h5" holds data acquired using horizontally polarized input light.

The DataFrame "tomos.h5" contains the following columns:

- **U**: The unitary intended to be implemented by the gadgets
- **U_fwd_tomoH**: Polarization tomography on the state created by horizontally polarized light passing through the **U** gadget in forwards direction.
- **U_fwd_tomoP**: Polarization tomography on the state created by diagonally polarized light passing through the **U** gadget in forwards direction.
- **Ur_fwd**: Unitary implemented by the **U** gadget in forwards direction, reconstructed using **U_fwd_tomoH** and **U_fwd_tomoP**
- **U_bwd_tomoH**: Polarization tomography on the state created by horizontally polarized light passing through the **U** gadget in backwards direction.
- **U_bwd_tomoP**: Polarization tomography on the state created by diagonally polarized light passing through the **U** gadget in backwards direction.
- **Ur_bwd**: Unitary implemented by the **U** gadget in backwards direction, reconstructed using **U_fwd_tomoH** and **U_fwd_tomoP**
- **V_fwd_tomoH**: Polarization tomography on the state created by horizontally polarized light passing through the **V** gadget in forwards direction
- **V_fwd_tomoP**: Polarization tomography on the state created by diagonally polarized light passing through the **V** gadget in forwards direction.
- **Vr_fwd**: Unitary implemented by the **V** gadget in forwards direction, reconstructed using **V_fwd_tomoH** and **V_fwd_tomoP**
- **V_bwd_tomoH**: Polarization tomography on the state created by horizontally polarized light passing through the **V** gadget in backwards direction.
- **V_bwd_tomoP**: Polarization tomography on the state created by diagonally polarized light passing through the **V** gadget in backwards direction.
- **Vr_bwd**: Unitary implemented by the **V** gadget in backwards direction, reconstructed using **V_fwd_tomoH** and **V_fwd_tomoP**.
- **fid_Ufwd_h**: Fidelity between the theoretically expected and experimentally obtained state U|H> in forwards direction.
- **fid_Ubwd_h**: Fidelity between the theoretically expected and experimentally obtained state U|H> in backwards direction.
- **fid_Vfwd_h**: Fidelity between the theoretically expected and experimentally obtained state V|H> in forwards direction.
- **fid_Vbwd_h**: Fidelity between the theoretically expected and experimentally obtained state V|H> in backwards direction.
- **fid_Ufwd_p**: Fidelity between the theoretically expected and experimentally obtained state U|P> in forwards direction.
- **fid_Ubwd_p**: Fidelity between the theoretically expected and experimentally obtained state U|P> in backwards direction.
- **fid_Vfwd_p**: Fidelity between the theoretically expected and experimentally obtained state V|P> in forwards direction.
- **fid_Vbwd_p**: Fidelity between the theoretically expected and experimentally obtained state V|P> in backwards direction.
- **fid_Ufwd_Ubwd_h**: Fidelity between the experimentally obtained states U|H> in forwards and backwards direction.
- **fid_Vfwd_Vbwd_h**: Fidelity between the experimentally obtained states V|H> in forwards and backwards direction.
- **fid_Ufwd_Ubwd_p**: Fidelity between the experimentally obtained states U|P> in forwards and backwards direction.
- **fid_Vfwd_Vbwd_p**: Fidelity between the experimentally obtained states V|P> in forwards and backwards direction.

The format for polarization tomography data is:
[h,v,p,m,r,l]  
where
**h** is the power acquired projecting the state in |H>,
**v** on |V>,
**p** on |+>,
**m** on |->,
**r** on |R>, and
**l** on |L>.