Definition of Physical and Tehnical security and responsibilities

"Technical security" is a term usually not used in English; for physical security, ISO 27001 defines as objective the following: "To prevent unauthorized physical access, damage and interference to the organization’s information and information processing facilities." and "To prevent loss, damage, theft or compromise of assets and interruption to the organization’s operations."

You should perform risk assessment and based on the results define your secure areas and protect them accordingly. The responsibility for physical security can vary from company to company - in traditional companies this is usually the responsibility of Security manager (who has no relationship with information security), while more modern approach would be to have Corporate security function which covers both information security and physical security, but also e.g. health & safety.