expectation_value()

SDef syten::IPEPS::Vert2CTM::expectation_value	(	State const &	psi,
		ATwoOp const &	op,
		bool	assume_norm_one = false
	)		const

Calculates the expectation value \( \langle \psi | \hat o | \psi \rangle / \langle \psi | \psi \rangle \) requiring that op acts on the two focus sites of this.

If assume_norm_one is true, \( \langle \psi | \psi \rangle \) is assumed to be one and not calculated.

References syten::Tensor< rank >::b(), syten::IPEPS::barTensor(), bsite, cb, cbb, syten::Deparallelise::cols(), ct, ctb, syten::IPEPS::dist(), syten::Basis::f(), syten::gM(), syten::gME(), syten::insertIOFullHalf(), syten::insertSwap(), lb, lbb, lt, ltb, std::move(), normSqd(), syten::STensorImpl::qr(), rb, rbb, rt, rtb, syten::IPEPS::sldlmap(), syten::split(), SYTEN_ASSERT, and tsite.

Referenced by syten::IPEPS::expectation().

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