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We describe a new method for quantum key distribution that utilizes phase modulation of sidebands of modulation by use of integrated electro-optic modulators at the transmitting and receiving modules. The system is shown to produce constructive or destructive interference with unity visibility, which should allow quantum cryptography to be carried out with high f lexibility by use of conventional devices.doi:10.1364/ol.24.000104 pmid:18071422 fatcat:7phvhk5cfrezhl7kiueeoptusi