The phrase "alone has access" is correct and usable in written English.
It can be used to indicate that only one specific person or entity has the ability to reach or utilize something.
Example: "In this secure facility, only the director alone has access to the confidential files."
Alternatives: "only has access" or "exclusively has access".
Because they were complex systems, they were operated by a staff of systems programmers, who alone had access to the computer.
"And there is no kind of conflict that becomes more intractable than when people are convinced that they alone have access to God's truth and the other side are the people of Satan".
Since the initial leak, a 4Chan user has claimed that they alone have access to 400 more images of nude celebrities, and asked other users for help to "figure out precisely how much has been leaked" - indicating that more than one user may be involved in the incident.
"There is no point in seeking where memories are preserved in my brain or in some nook of my mind to which I alone have access: for they are recalled to me externally" (Halbwachs 1925/1992, p. 38).
Because I doubt you like the idea of an officious bureaucrat listening into your phone conversations from Whitehall, let alone having access to every piece of correspondence you have with everyone in your life.
Women and men across America value their individual liberties too much to let their boss decide whether or not they can get vaccinations or health care, let alone have access to birth control.
He – and he alone – has 100% access to the Vatican's archives, the biggest collection of Renaissance music in the world.
The Ego alone has direct access to the given, that is, to the raw materials of the existent which are presented to consciousness with an immediacy at once inescapable and irreducible.
He collected $8.3 million in salary and bonus in 2000 alone and had access to a company jet.
