Bryan Kohberger’s gonna have no cellmates and no distractions … ’cause he’s just been moved to solitary confinement at Idaho’s Maximum Security Institution, TMZ has learned.

Sources tell TMZ Kohberger’s long-term restrictive housing — J Block — isn’t just any penitentiary unit. It holds up to 128 inmates, and includes everyone from protective custody incarcerees to long-term isolation holds … and even death row.

It’s a grim setup — inmates in long-term restrictive housing live alone in their cells, only allowed to exit in restraints … they get showers every other day, and are permitted just one hour of outdoor time daily.

If there’s any silver lining in Kohberger’s solitary lockdown life, it’s this — inmates can still place commisary orders, they can send messages through JPay, and maybe most importantly to them … they still get access to religious services.

Bryan was recently hit with four consecutive life sentences for the brutal murders of Kaylee Goncalves, Madison Mogen, Xana Kernodle, and Ethan Chapin — and before that, he faced a firestorm in court as the victims’ families tore into him over the horrific killings.