Running the System

Network

There are two networks. One for the client and one for communication between Alice and Bob.

In standard operation, the admin is on the client network and uses scripts on his local computer to communicate with the devices. These scripts are TCP-clients that connect to servers on the machines and send/receive messages and data.

In standard operation, the client uses the ETSI14 standard to get the key via http(s).

For development and debugging you can connect through ssh and operate directly on the machines.

Standard operation

Clone repo git@github.com:Veriqloud/kiwi_hw_control.git

Power on the system

power on the White Rabbit Switches, wait about 20sec for lights to flash
power on the VQ box, this will power on the FPGA board
power on the computer by pressing the button on the back of the box (or wakeonlan over the netowk)

Point the scripts to the appropriate network.json

export QLINE_CONFIG_DIR=path_to/kiwi_hw_control/config/qline1

Go to kiwi_hw_control/qline_clean/local. This is the folder from which you can initialize and calibrate the system. There are three programs:

hw_alice.py / hw_bob.py to change and get the current hardware parameters (check their help messages)
hws.py to calibrate the system, i.e. Alice and Bob at the same time.
mon.py to get the status and plot counts or gates

Run

mon.py --status

to get basic info on the system

If you are lucky,

hws.py --full_init

is all you need. This might take up to two minutes. If you get a fail message, try again.

ssh setup (required for development, deployment and debugging)

Put something like this into your ~/.ssh/config:

Host Alice
    HostName ql001.home
    User vq-user
    IdentityFile ~/.ssh/your_ssh_key
    ControlPath ~/.ssh/controlmasters/%r@%h:%p
    ControlMaster auto
    ControlPersist 1h

Host Bob
    HostName ql002.home
    User vq-user
    IdentityFile ~/.ssh/your_ssh_key
    ControlPath ~/.ssh/controlmasters/%r@%h:%p
    ControlMaster auto
    ControlPersist 1h

Host vq
    HostName veriqloud.pro.dns-orange.fr
    User vq-user
    IdentityFile ~/.ssh/your_ssh_key
    ControlPath ~/.ssh/controlmasters/%r@%h:%p
        ControlMaster auto
        ControlPersist 1h

Host RemoteAlice
    ProxyCommand ssh vq nc ql001 22
    User vq-user
    IdentityFile ~/.ssh/your_ssh_key
    ControlPath ~/.ssh/controlmasters/%r@%h:%p
        ControlMaster auto
        ControlPersist 1h

Host RemoteBob
    ProxyCommand ssh vq nc ql002 22
    User vq-user
    IdentityFile ~/.ssh/your_ssh_key
    ControlPath ~/.ssh/controlmasters/%r@%h:%p
        ControlMaster auto
        ControlPersist 1h

The last three entries are for connecting from the internet through port forwarding on the VQ server.

Make sure your public key is on the machines, e.g. ssh-copy-id vq-user@ql001.home

Manually optimizing the qber

ssh on the systems

You can check with qber that the system is running fine:

On Bob

cd servers
qber

On Alice

qber 6400

This will print the correlation matrix of the relative count rates for all the 4x4 possible angle choices.

On your local machine run hw_alice.py and hw_bob.py to change parameters.

Misc

hw_alice.py set --fake_rng_seq [off, random]
hw_bob.py set --fake_rng_seq [off, random]
hw_alice.py set --insert_zeros on
hw_alice.py set --zero_pos 14