M.R. Carey: Infinity Gate. Parallel universes, quantum stuff, great story, recommended. BUT, be warned, it's the first of a series, ends on a cliffhanger and the second book is due next year - Eek!
Adrian Tchaikovsky: Doors of Eden. Quantum immortality for sure but involves more mass murder than suicide. ( I'm not his agent or his mum, I promise, even though I do plug him shamelessly)
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